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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 29, 2013	Nov. 08, 2013
Document And Entity Information [Abstract]
Document Type	10-Q/A
Amendment Flag	false
Document Period End Date	Sep. 29, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	PBPB
Entity Registrant Name	Potbelly Corporation
Entity Central Index Key	0001195734
Current Fiscal Year End Date	--12-29
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		29,137,706

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 29, 2013	Dec. 30, 2012
Current assets
Cash and cash equivalents	$ 25,119	$ 22,595
Accounts receivable, net of allowances of $12 and $16 as of September 29, 2013 and December 30, 2012, respectively	4,011	3,276
Inventories	2,125	1,910
Prepaid expenses and other current assets	5,667	4,683
Total current assets	36,922	32,464
Property and equipment, net	77,415	69,309
Intangible assets, net	3,404	3,404
Goodwill	1,428	1,428
Deferred income taxes	14,427	16,110
Deferred expenses, net and other assets	4,821	3,984
Total assets	138,417	126,699
Current liabilities
Accounts payable	3,154	2,586
Accrued expenses	17,758	14,553
Accrued dividend payable	49,854
Accrued income taxes	513	81
Current portion of long-term debt	14,074	74
Total current liabilities	85,353	17,294
Long-term debt, net of current portion	1,036	15,095
Deferred rent and landlord allowances	12,107	11,849
Other long-term liabilities	823	846
Total liabilities	99,319	45,084
Commitments and contingencies
Redeemable convertible preferred stock, $0.01 par value-authorized 17,183,632 shares; issued and outstanding 16,086,375 shares as of September 29, 2013, and December 30, 2012, respectively	265,440	250,343
Equity (deficit)
Common stock, $0.01 par value-authorized, 35,500,000 shares; issued and outstanding 4,351,869 and 4,233,977 shares as of September 29, 2013, and December 30, 2012, respectively	44	42
Warrants	942	1,552
Additional paid-in-capital
Accumulated deficit	(227,548)	(170,518)
Total stockholders' deficit	(226,562)	(168,924)
Non-controlling interest	220	196
Total deficit	(226,342)	(168,728)
Total liabilities and equity	$ 138,417	$ 126,699

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 29, 2013	Dec. 30, 2012
Statement Of Financial Position [Abstract]
Allowances on accounts receivable	$ 12	$ 16
Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Redeemable convertible preferred stock, authorized	17,183,632	17,183,632
Redeemable convertible preferred stock, issued	16,086,375	16,086,375
Redeemable convertible preferred stock, outstanding	16,086,375	16,086,375
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	35,500,000	35,500,000
Common stock, issued	4,351,869	4,233,977
Common stock, outstanding	4,351,869	4,233,977

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013	Sep. 23, 2012
Revenues
Sandwich shop sales, net	$ 77,747	$ 69,659	$ 224,214	$ 200,853
Franchise royalties and fees	274	210	737	553
Total revenues	78,021	69,869	224,951	201,406
Sandwich shop operating expenses
Cost of goods sold, excluding depreciation	23,014	20,238	65,767	58,389
Labor and related expenses	21,223	19,778	62,217	56,618
Occupancy expenses	9,295	8,135	26,826	22,885
Other operating expenses	7,946	7,317	23,058	20,767
General and administrative expenses	8,293	6,874	24,298	22,542
Depreciation expense	4,460	4,080	13,284	11,633
Pre-opening costs	364	630	1,083	1,760
Impairment and loss on disposal of property and equipment	250		329	78
Total expenses	74,845	67,052	216,862	194,672
Income from operations	3,176	2,817	8,089	6,734
Interest expense	97	176	330	427
Other expense		4	2	6
Income before income taxes	3,079	2,637	7,757	6,301
Income tax expense	905	84	2,792	765
Net income	2,174	2,553	4,965	5,536
Net income (loss) attributable to non-controlling interest	9	5	24	(35)
Net income attributable to Potbelly Corporation	2,165	2,548	4,941	5,571
Dividend declared to common and preferred stockholders	(49,854)		(49,854)
Accretion of redeemable convertible preferred stock to maximum redemption value	(4,796)	(5,545)	(15,097)	(13,887)
Net loss attributable to common stockholders	$ (52,485)	$ (2,997)	$ (60,010)	$ (8,316)
Net loss per common share attributable to common stockholders:
Basic	$ (12.29)	$ (0.75)	$ (14.12)	$ (2.09)
Diluted	$ (12.29)	$ (0.75)	$ (14.12)	$ (2.09)
Weighted average shares outstanding:
Basic	4,268,953	3,972,873	4,250,819	3,972,873
Diluted	4,268,953	3,972,873	4,250,819	3,972,873

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Equity (Deficit) - USD ($) $ in Thousands	Total	Redeemable Convertible Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member] Series A Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member] Series B Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member] Series C Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member] Series D Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member] Series E Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member] Series F Preferred Stock [Member]	Equity (Deficit) [Member] Common Stock [Member]	Equity (Deficit) [Member] Warrant [Member]	Equity (Deficit) [Member] Additional Paid-in Capital [Member]	Equity (Deficit) [Member] Accumulated Deficit [Member]	Equity (Deficit) [Member] Noncontrolling Interest [Member]
Beginning Balance at Dec. 25, 2011	$ (185,302)	$ 239,848	$ 50,637	$ 45,062	$ 22,745	$ 17,570	$ 76,337	$ 27,497	$ 40	$ 2,068		$ (187,410)
Beginning Balance, Preferred Shares at Dec. 25, 2011		16,086,375	3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743
Beginning Balance, Common Shares at Dec. 25, 2011									3,972,873
Net income	5,536											5,571	$ (35)
Contributions from non-controlling interest	230												230
Issuance of stock warrants										909	$ (909)
Changes in redemption value of preferred stock	(13,887)	$ 13,887	$ 3,210	$ 2,856	$ 1,441	$ 1,113	$ 3,524	$ 1,743			(1,411)	(12,476)
Amortization of stock-based compensation	2,320										2,320
Ending Balance at Sep. 23, 2012	(191,103)	$ 253,735	$ 53,847	$ 47,918	$ 24,186	$ 18,683	$ 79,861	$ 29,240	$ 40	2,977		(194,315)	195
Ending Balance, Prefereed Shares at Sep. 23, 2012		16,086,375	3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743
Ending Balance, Common Shares at Sep. 23, 2012									3,972,873
Beginning Balance at Dec. 25, 2011	$ (185,302)	$ 239,848	$ 50,637	$ 45,062	$ 22,745	$ 17,570	$ 76,337	$ 27,497	$ 40	2,068		(187,410)
Beginning Balance, Preferred Shares at Dec. 25, 2011		16,086,375	3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743
Beginning Balance, Common Shares at Dec. 25, 2011									3,972,873
Exercise of stock warrants, Shares	261,104
Ending Balance at Dec. 30, 2012	$ (168,728)	$ 250,343	$ 52,796	$ 46,983	$ 23,715	$ 18,319	$ 79,861	$ 28,669	$ 42	1,552		(170,518)	196
Ending Balance, Prefereed Shares at Dec. 30, 2012	16,086,375	16,086,375	3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743
Ending Balance, Common Shares at Dec. 30, 2012	4,233,977								4,233,977
Net income	$ 4,965											4,941	24
Beneficial Conversion Charge											50	(50)
Contributions from non-controlling interest
Exercise of stock warrants	$ 2								$ 2
Exercise of stock warrants, additional paid in capital										(610)	610
Exercise of stock warrants, Shares	117,892								117,892
Dividend declared to common and preferred stockholders	$ (49,854)										(49,854)
Changes in redemption value of preferred stock	(15,097)	$ 15,097	$ 3,582	$ 3,188	$ 1,609	$ 1,251	$ 3,523	$ 1,944			46,824	(61,921)
Amortization of stock-based compensation	2,370										$ 2,370
Ending Balance at Sep. 29, 2013	$ (226,342)	$ 265,440	$ 56,378	$ 50,171	$ 25,324	$ 19,570	$ 83,384	$ 30,613	$ 44	$ 942		$ (227,548)	$ 220
Ending Balance, Prefereed Shares at Sep. 29, 2013	16,086,375	16,086,375	3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743
Ending Balance, Common Shares at Sep. 29, 2013	4,351,869								4,351,869

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,965	$ 5,536
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,284	11,633
Deferred income tax	1,683	78
Deferred rent and landlord allowances	258	1,320
Amortization of stock compensation expense	2,370	2,320
Asset impairment and disposal of property and equipment	329	78
Amortization of debt issuance costs	46	154
Changes in operating assets and liabilities:
Accounts receivable, net	(735)	(859)
Inventories	(215)	(93)
Prepaid expenses and other assets	(1,475)	1,506
Accounts payable	602	345
Accrued and other liabilities	3,267	(1,561)
Net cash provided by operating activities	24,379	20,457
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(21,265)	(19,700)
Net cash used in investing activities	(21,265)	(19,700)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of Series F warrants	2
Proceeds from long-term debt		14,000
Payments on debt	(59)	(14,000)
Payments on note payable		(55)
Payment of deferred financing costs		(124)
Payment of costs associated with initial public offering	(533)
Contributions from non-controlling interest		230
Net cash (used in) provided by financing activities	(590)	51
NET INCREASE IN CASH AND CASH EQUIVALENTS	2,524	808
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	22,595	24,146
CASH AND CASH EQUIVALENTS AT END OF PERIOD	25,119	24,954
Supplemental cash flow information:
Income taxes paid	727	794
Interest paid	261	621
Supplemental non-cash investing and financing activities:
Unpaid liability for purchases of property and equipment	2,561	1,636
Accretion of redeemable convertible preferred stock to maximum redemption value	15,097	13,887
Accrued dividend payable	$ 49,854

Organization and Other Matters	9 Months Ended
Organization and Other Matters	Sep. 29, 2013
Accounting Policies [Abstract]
Organization and Other Matters	(1) Organization and Other Matters *Business* Potbelly Corporation (the “Company” or “Potbelly”), through its wholly owned subsidiary, Potbelly Sandwich Works LLC, operates Potbelly Sandwich Works sandwich shops in 18 states and the District of Columbia. As of December 30, 2012 and September 29, 2013, the Company had 264 and 288 company-operated shops, respectively. During fiscal year 2012, the Company opened 31 new shops and closed one shop. During the 39 weeks ended September 29, 2013, the Company opened 25 new shops and closed one shop. The Company also sells and administers franchises of new Potbelly Sandwich Works sandwich shops. The first domestic and international franchise locations administered by the Company opened during February 2011. As of the fiscal year ended 2012, five franchised shops were in operation domestically and ten franchised shops were in operation internationally. As of September 29, 2013, seven franchised shops were in operation in domestic locations and twelve franchised shops were in operation internationally. The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Potbelly Corporation and its subsidiaries and the notes thereto included in the Company’s prospectus dated October 3, 2013, filed pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”), with the Securities and Exchange Commission (“SEC”) on October 4, 2013. The unaudited condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the SEC regarding interim financial reporting. The December 30, 2012 condensed consolidated balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of December 30, 2012 and September 29, 2013, its statement of operations for the 13 weeks and 39 weeks ended September 23, 2012 and September 29, 2013 and its statement of cash flows for the 39 weeks ended September 23, 2012 and September 29, 2013 have been included. The consolidated statements of operations for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. The Company does not have any components of other comprehensive income (loss) recorded within its consolidated financial statements, and, therefore, does not separately present a statement of comprehensive income (loss) in its consolidated financial statements. *Initial Public Offering* On October 9, 2013, the Company completed an initial public offering of 8,625,000 shares of common stock. Upon the completion of such initial public offering, all outstanding shares of preferred stock of the Company converted into common stock. See Note 8, “Subsequent Events.” Unless otherwise stated, the unaudited condensed consolidated financial statements and these notes thereto do not include the effects of the initial public offering as it was completed subsequent to September 29, 2013. *Principles of Consolidation* The unaudited condensed consolidated financial statements include the accounts of Potbelly Corporation; its wholly owned subsidiary, Potbelly Illinois, Inc. (“PII”); PII’s wholly owned subsidiaries, Potbelly Franchising, LLC, Potbelly Sandwich Works, LLC (“LLC”) and 17 of LLC’s wholly owned subsidiaries, collectively, the “Company.” All significant intercompany balances and transactions have been eliminated in consolidation. For the Company’s consolidated joint venture, non-controlling interest represents the non-controlling partner’s share of the assets, liabilities and operations related to the joint venture investment in Potbelly Airport II Boston, LLC, related to one shop located in the Boston Logan International Airport. The Company owns a seventy-five percent interest in this consolidated joint venture. *Use of Estimates* The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions, primarily related to long-lived assets, income taxes, stock-based compensation and common stock equity valuations, that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. *Fiscal Year* The Company uses a 52/53-week fiscal year that ends on the last Sunday of the calendar year. Approximately every six or seven years a 53rd week is added. Fiscal 2012 consisted of 53 weeks. The fiscal quarters ended September 23, 2012 and September 29, 2013 each consisted of 13 weeks and the fiscal year-to-date periods ended September 23, 2012 and September 29, 2013 each consisted of 39 weeks.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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+ Details

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 29, 2013
Fair Value Disclosures [Abstract]
Fair Value Measurements	(2) Fair Value Measurements The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and all other current liabilities approximate fair values due to the short maturities of these investments. The carrying amounts of borrowings approximate fair value as interest rates on the credit facility varies with market interest rates and negotiated terms and conditions are consistent with market rates. The fair value of the Company, used to calculate the maximum redemption value of the redeemable convertible preferred stock and to measure the Black-Scholes value of the common stock as a key assumption in determining compensation expense associated with our stock options (see Note 7), was estimated using information derived from market data obtained during the initial public offering that was in process as of the fiscal quarter end and completed shortly thereafter. In addition, the Company assesses potential impairments to its long-lived assets, which includes property and equipment, whenever events or circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of an asset is measured by a comparison of the carrying amount of an asset group to its estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of the asset group exceeds its estimated undiscounted future cash flows, an impairment charge is recognized as the amount by which the carrying amount of the asset exceeds the fair value of the asset. Shop-level assets are grouped together for the purpose of the impairment assessment. The fair value of the shop assets was determined using the discounted future cash flow method of anticipated cash flows through the shop’s lease-end date using fair value measurement inputs classified as Level 3. Level 3 inputs are derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Earnings per share

9 Months Ended

Sep. 29, 2013

Earnings Per Share [Abstract]

Earnings per share

(3) Earnings per share

Basic and diluted income (loss) per common share attributable to common stockholders have been calculated using the weighted average number of common shares outstanding for the period. Diluted income (loss) per common share attributable to common stockholders is computed by dividing the income (loss) allocated to common stockholders utilizing the two-class method by the weighted average number of fully diluted common shares outstanding. Our redeemable convertible preferred stock are all considered participating securities requiring the two-class method to calculate basic and diluted earnings per share. In periods of a net loss attributable to common stockholders, the redeemable convertible preferred stock are excluded from the computation of basic earnings per share due to the fact that they are not required to fund losses and the redemption amount is not reduced as a result of losses. Dilutive securities do not include stock options awarded to employees that have a performance condition requiring the completion of an initial public offering of common stock (an “IPO”), as that performance condition was not satisfied at the reporting date and the holders of these options had no rights in our undistributed earnings at that time.


	13 Weeks Ended						39 Weeks Ended
	September 29, 2013			September 23, 2012			September 29, 2013			September 23, 2012
Calculation of undistributed (loss) for basic and diluted shares:
Net income attributable to Potbelly Corporation	$	2,165		$	2,548		$	4,941		$	5,571
Less: Dividend declared to common and preferred stockholders		(49,854	)		—			(49,854	)		—
Less: Accretion of redeemable convertible preferred stock to maximum redemption value		(4,796	)		(5,545	)		(15,097	)		(13,887	)

Undistributed loss for basic and diluted shares	$	(52,485	)	$	(2,997	)	$	(60,010	)	$	(8,316	)

Allocation of undistributed(loss) to participating securities:
Common shares	$	(52,485	)	$	(2,997	)	$	(60,010	)	$	(8,316	)
Redeemable convertible preferred shares		—			—			—			—

Undistributed (loss) income	$	(52,485	)	$	(2,997	)	$	(60,010	)	$	(8,316	)

Weighted average common shares outstanding-basic		4,268,953			3,972,873			4,250,819			3,972,873
Plus: Effect of potential stock options exercise		—			—			—			—
Plus: Effect of potential warrant exercise		—			—			—			—

Weighted average common shares outstanding-diluted		4,268,953			3,972,873			4,250,819			3,972,873

Income (loss) per share available to common stockholders-basic	$	(12.29	)	$	(0.75	)	$	(14.12	)	$	(2.09	)
Income (loss) per share available to common stockholders-diluted	$	(12.29	)	$	(0.75	)	$	(14.12	)	$	(2.09	)
Potentially dilutive shares that are considered anti-dilutive:
Common share options		4,744,664			4,446,049			4,744,664			4,446,049
Warrants		241,704			378,996			241,704			378,996

Income Taxes	9 Months Ended
Income Taxes	Sep. 29, 2013
Income Tax Disclosure [Abstract]
Income Taxes	(4) Income Taxes The Company recognized income tax expense of $2.8 million on pre-tax income of $7.8 million, or an effective tax rate of 36.0%, for the 39 weeks ended September 29, 2013, compared to income tax expense of $0.8 million on pre-tax income of $6.3 million, or an effective tax rate of 12.1%, for the 39 weeks ended September 23, 2012. The difference between the statutory rate and the effective tax rate is primarily attributable to state income taxes and certain federal and state tax credits. The increase in the effective tax rate primarily relates to the Company recognizing federal tax benefits, which were not recognized in the comparable prior period. The Company’s effective tax rate for the 39 weeks ended September 29, 2013 was primarily attributable to U.S. and state income taxes, offset by federal and local tax credits. The Company’s effective tax rate for the 39 weeks ended September 23, 2012 was primarily attributable to state income taxes. Based on management’s evaluation of certain factors, in the fourth quarter of fiscal 2012, the Company released a valuation allowance for all U.S. federal and state deferred tax assets.

Long-term debt

9 Months Ended

Sep. 29, 2013

Debt Disclosure [Abstract]

Long-term debt

(5) Long-term debt

Long-term debt consisted of the following (in thousands):


	September 29, 2013		December 30, 2012
Senior credit facility (a)	$	14,000	$	14,000
Note payable (b)		1,110		1,169

Total long-term debt		15,110		15,169
Less: Current portion		14,074		74

Long-term debt, net of current portion	$	1,036	$	15,095

The Company was in compliance with all of its debt covenants as of September 29, 2013 and December 30, 2012. On October 24, 2013, the Company used $14.0 million of the net proceeds from its initial public offering to repay the amounts outstanding under the credit facility. See Note 8, “Subsequent Events.”

(a) Credit facility

On September 21, 2012, the Company entered into a five-year revolving credit facility agreement with JPMorgan Chase Bank, N.A. that expires in September 2017 and provides for borrowings up to $35.0 million to fund capital expenditures for new shops, renovations and maintenance of existing shops, and to provide ongoing working capital for other general and corporate purposes. The credit facility contains customary representations, warranties and negative and affirmative covenants, including a requirement to maintain a maximum leverage ratio, as defined, of 2.25:1 and a minimum debt service coverage ratio, as defined, of 1.5:1. The credit facility also limits the restricted payments (primarily distributions and equity repurchases) that the Company may make, unless the Company obtains certain waivers or amendments from its lender. The Company was in compliance with these restrictions and conditions as of December 30, 2012 and September 29, 2013. The credit facility is secured by substantially all assets of the Company. Borrowings under the credit facility bear interest at interest rates based upon either the base rate or the London InterBank Offered Rate, plus or minus the applicable margins. The base rate is the higher of the prime rate and the federal funds rate, plus 0.50%. The Company’s outstanding borrowings under the credit facility had a weighted average interest rate of 1.35% as of December 30, 2012 and September 29, 2013. On October 24, 2013, the Company used $14.0 million of the net proceeds from its initial public offering to repay the amounts outstanding under the credit facility. See Note 8, “Subsequent Events.”

(b) Note payable

On March 15, 2007, the Company entered into a long-term note payable associated with the acquisition of certain assets of Pot Belly Deli, Inc., an unrelated California company, including the Pot Belly trade name, certain design marks, and other related assets. The Company records interest on the note payable under the effective interest method at an interest rate of 6% and recorded interest expense of $57 thousand for the 39 weeks ended September 23, 2012 and $54 thousand for the 39 weeks ended September 29, 2013. Payment of interest and principal is made monthly. The final payment of the note will be made on April 1, 2015.

Capital Stock and Warrants

9 Months Ended

Sep. 29, 2013

Equity [Abstract]

Capital Stock and Warrants

(6) Capital Stock and Warrants

As of December 30, 2012 and September 29, 2013, the Company had authorized an aggregate of 52,683,632 shares of capital stock, of which 35,000,000 shares were designated as common stock, 500,000 shares were designated as non-voting common stock, and 17,183,632 shares were designated as preferred stock. The preferred stock consisted of 4,197,377 shares designated as Series A preferred stock, 3,375,221 shares designated as Series B preferred stock, 1,666,668 shares designated as Series C preferred stock, 1,250,000 shares designated as Series D preferred stock, 4,194,366 shares designated as Series E preferred stock, and 2,500,000 shares designated as Series F preferred stock. As of September 29, 2013, the Company had issued and outstanding 4,351,869 shares of common stock, no shares of non-voting common stock, 3,697,377 shares of Series A preferred stock, 3,290,294 shares of Series B preferred stock, 1,646,595 shares of Series C preferred stock, 1,250,000 shares of Series D preferred stock, 4,194,366 shares of Series E preferred stock, and 2,007,743 shares of Series F preferred stock.

A roll-forward of the Company’s issued warrants as of September 29, 2013 is set forth below:


Unexercised Warrants	Number of Warrants
Outstanding—December 25, 2011		378,996
Issuance of warrants at $8.16 per share (a)		241,704
Exercise of warrants at $5.46 per share		(261,104	)

Outstanding—December 30, 2012		359,596
Exercise of warrants at $0.01 per share		(117,892	)

Outstanding—September 29, 2013		241,704

(a)

As part of the initial investment by outside investors in 2001, the Company issued stock warrants convertible to 200,000 shares of common stock at an exercise price of $5.00 per share, which expired on September 1, 2011. After the expiration of these warrants and to recognize past and continued service to the board of directors, the Company issued an additional 241,704 warrants at an exercise price of $8.16 per share. The Company used the following assumptions for purposes of valuing these warrants granted in 2011: common stock fair value of $8.16 per share; expected life of warrants-five years; volatility-53.0%; risk-free interest rate-1.1%; and dividend yield-0.0%.

As of September 29, 2013, all series of preferred stock were subject to substantially the same general terms and conditions. Dividends accrued (whether or not declared) on each share of preferred stock at a rate of 6% per annum of the applicable liquidation value until the first to occur of (1) the date on which the applicable liquidation value of such share is paid to the holder in connection with a significant event, (2) the date on which such share is converted into common stock, or (3) the date on which such share is acquired by the Company. Dividends were cumulative, but were payable only upon their redemption or the occurrence of a significant event that would result in a distribution to their holders of less than 110% of the shares’ liquidation value (generally the applicable gross issuance price of the shares). A significant event includes a merger, sale of substantially all assets, change of control, or liquidation of the Company, but it does not include an IPO. The terms of the preferred stock provided that unpaid dividends would be forfeited upon any conversion of preferred stock into common stock.

As of September 29, 2013, the terms of the preferred stock provided that all shares of preferred stock would automatically convert to common stock in the event of a qualified IPO, as defined; the election of the holders of a majority of the shares of preferred stock; or the conversion of at least a majority of the shares of issued preferred stock. None of the shares of preferred stock were mandatorily redeemable. Subsequent to December 24, 2014, preferred stock may have been redeemed upon a majority vote of the preferred stockholders for a period of 12 months (“Redemption Election Period”). If the holders of at least a majority of the preferred stock then outstanding did not approve the redemption of preferred shares outstanding during the Redemption Election Period, the Company would have had no further obligation to redeem any shares of preferred stock. Dividends were cumulative, but were payable only upon their redemption or the occurrence of a significant event that would result in a distribution to their holders of less than 110% of the shares’ liquidation value (generally the applicable gross issuance price of the shares). As of September 29, 2013, the Company classified the preferred stock outside of permanent equity on the balance sheet as redemption of the preferred stock was outside the control of the Company.

The Company recognized changes in the redemption value immediately as they occurred via direct charges to additional paid-in capital and then to accumulated deficit, and adjusted the carrying value of the preferred stock to equal its maximum redemption value at the end of each reporting period. In the event of a redemption, the price paid by the Company for the preferred stock would be the greater of (a) the liquidation value of the preferred stock series being redeemed, plus any accrued and unpaid dividends, or (b) the amount in respect of such share of preferred stock that such holder would have been entitled to receive on an as-converted basis assuming all the shares have been converted into common stock. The form of consideration in the event of liquidation would be the same for the common stockholders as would be provided to the preferred stockholders. The redemption and conversion features do not require bifurcation and separate measurement in the financial statements since neither of the features meet the net settlement criteria under ASC Topic 815, Derivatives and Hedging.

The Company measured its redeemable convertible preferred stock at its maximum redemption value at each reporting period. The fair value of the Company, used to calculate the maximum redemption value of the redeemable convertible preferred stock and to measure the value of the common stock as a key assumption in the determination of the compensation expense associated with the Company’s stock options, was determined with assistance from an independent third-party valuation specialist. The valuations of the Company and its common stock were determined based on valuation methodologies and assumptions selected in accordance with the guidelines outlined in the American Institute of Certified Public Accountants Practice Aid, Valuation of Privately-Held-Companies Equity Securities Issued as Compensation. In the absence of observable market data regarding the value of the Company’s stock, the valuation of the Company and its common stock was estimated using multiple valuation approaches, primarily an income and market approach. The income approach is based on the present value of estimated future cash flows, and relies upon significant assumptions and estimates, including those related to the selected discount rate and forecasted revenues and expenses. The market approach is based on a comparison to observed fair values of comparable peer companies and recent market transactions, adjusted for the relative size and profitability of these peer companies relative to the Company.

As of September 29, 2013, each share of common stock had the same relative rights and was identical in all respects to each other share of common stock. Each holder of shares of common stock was entitled to one vote for each share held by such holder at all meetings of stockholders. As of September 29, 2013, each share of non-voting common stock had no voting rights. The terms of the non-voting common stock provided that all shares of non-voting common stock would convert into voting common stock on a 1:1 basis immediately prior to the closing of an underwritten IPO or sale of the Company. The redeemable convertible preferred stock included down-round provisions which would adjust the conversion price for any additional stock issued without consideration or for a consideration per share less than the respective conversion price for one or more of the series of preferred stock in effect immediately prior to the issuance of such additional stock.

On February 26, 2013, the Company issued 59,865 stock options to Bryant Keil, the Company’s Founding Chairman and current member of the board of directors, which are exercisable without restriction and vested immediately. Subsequent to the issuance, the applicable conversion price for the Series D preferred stock and Series E preferred stock was adjusted under the conversion procedure provision in order to prevent dilution. After the adjustment, the Series D preferred stock and Series E preferred stock were convertible into common stock at the conversion rates of 1:1.03 and 1:1.03, respectively.

On October 9, 2013, the Company completed an initial public offering. See Note 8, “Subsequent Events.” Effective upon the closing of such offering, all shares of preferred stock and non-voting common stock converted into common stock and all dividends accrued on the shares of preferred stock were forfeited.

In August 2013, the Company modified 241,704 of warrants issued to Oxford Capital Partners, Inc. that were set to expire upon the consummation of an IPO to extend the expiration date of such warrants to five years from the date of the consummation of an IPO. In accordance with ASC Topic 718, Compensation – Stock Compensation, the Company recorded a charge of approximately $0.1 million related to the incremental value associated with the extension of the expiration date.

On August 1, 2013, the Company’s board of directors unanimously approved a resolution to amend certain terms of the Company’s preferred stockholder agreements to reduce certain pricing thresholds for the completion of a qualified IPO, with such term defined in the agreements. The Company evaluated the impact of the amendments on the related preferred shares by estimating the fair value of such shares immediately prior to and after the amendments. As there was an insignificant change in the fair value of the preferred shares as a result of the amendments, the Company concluded the amendments represented a modification to the preferred share agreements. Therefore, no change in value was recorded in the condensed consolidated statement of redeemable convertible preferred stock and equity (deficit). In addition, the Company’s board of directors declared a cash dividend on August 1, 2013, in an aggregate amount of approximately $49.9 million on shares of the Company’s common and preferred stock outstanding on the day immediately prior to the closing date of the Company’s initial public offering. The dividend was recorded as an accrued dividend payable in the condensed consolidated balance sheet as of September 29, 2013 as substantive conditions for the initial public offering were met as of September 29, 2013. The Company paid the cash dividend on October 9, 2013 from the net proceeds of the Company’s initial public offering.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 4
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Topic 505
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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-Paragraph d
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Stock Options

9 Months Ended

Sep. 29, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Options

(7) Stock Options

2013 Long-Term Incentive Plan

On July 31, 2013, the Company’s board of directors approved the adoption of the 2013 Long-Term Incentive Plan, which replaced the 2004 Incentive Plan in conjunction with the Company’s initial public offering. The Company will no longer make awards under the 2004 Incentive Plan. However, the 2004 Incentive Plan will continue to govern outstanding awards granted prior to its termination. As of September 29, 2013, there have been no options granted under the 2013 Long-Term Incentive Plan. The Company has 1,500,000 shares reserved for future issuance under the 2013 Long-Term Incentive Plan. See Note 8, “Subsequent Events” for options granted after September 29, 2013.

Stock Options Granted Under the 2001 and 2004 Equity Incentive Plans

The Company has granted stock options under its 2001 and 2004 Equity Incentive Plans (the “Plans”). The Plans permit the granting of awards to employees and nonemployee officers, consultants, agents, and independent contractors of the Company in the form of stock appreciation rights, stock awards, and stock options. The Plans give broad powers to the Company’s board of directors to administer and interpret the Plans, including the authority to select the individuals to be granted options and rights and to prescribe the particular form and conditions of each option to be granted.

Under the Plans, the number of shares and exercise price of each option are determined by the committee designated by the Company’s board of directors. The options granted are generally exercisable within a 10-year period from the date of grant, upon the consummation of an IPO under the Securities Act or at the discretion of the board of directors. Certain options have been issued to key executives, which are exercisable without restriction. Options issued and outstanding expire on various dates through the year 2023. The range of exercise prices of options outstanding as of September 29, 2013, is $7 to $14 per option, and the options vest over a range of immediately to five-year periods.

Under the 2001 Plan, the Company had 746,749 shares reserved for issuance. In September 2011, the 2001 Plan expired with options outstanding under the plan still available for exercise. As of December 30, 2012 and September 29, 2013, a total of 3,960,998 and 4,289,994 shares of common stock have been reserved for issuance under the 2004 Equity Incentive Plan and a total of 500,000 shares of non-voting common stock have been reserved for issuance under a Stock Option Agreement and Plan (the “Agreement”). In 2007, the Company entered into the Agreement, which granted a certain key executive 500,000 options of non-voting common stock.

Activity under the Plans and the Agreement is as follows:


Options	Shares (Thousands)			Weighted Average Exercise Price		Aggregate Intrinsic Value (Thousands)		Weighted Average Remaining Term (Years)
Outstanding—December 25, 2011		4,261			9.19	$	2,229		6.34

Granted		504			8.65
Exercised		—			—
Canceled		(552	)		7.67

Outstanding—December 30, 2012		4,213			9.30	$	5,348		5.93

Granted		848			10.06
Exercised		—			—
Canceled		(316	)		8.40

Outstanding—September 29, 2013		4,745			8.99	$	15,434		6.22

On February 26, 2013, the Company issued 59,865 stock options to Bryant Keil, the Company’s Founding Chairman and current member of the board of directors, which are exercisable without restriction and vested immediately. The fair value of the options was determined using the Black-Scholes-Merton option pricing model. The Company used the following assumptions for purposes of valuing these option grants: common stock fair value of $9.47 per share; expected life of options—five years; volatility—46.6%; risk-free interest rate—0.8%; and dividend yield—0.0%. The Company used the simplified method for determining the expected life of the options. The Company was unable to calculate specific stock price volatility as a private company, and as such, the Company used a blended volatility rate for comparable publicly traded companies.

On July 29, 2013, the Company entered into employment agreements with certain executives, including Charlie Talbot, its Chief Financial Officer, and John Morlock, its Senior Vice President of Operations. The terms of the agreements are substantially similar to one another and include compensation arrangements consistent with their current compensation arrangements as well as the acceleration of 278,272 unvested stock options under the 2004 Equity Plan, of which 141,341 options include a performance condition that restricts the option holders’ ability to exercise vested options until the consummation of an IPO under the Securities Act or at the discretion of the Company’s board of directors. Accordingly, all outstanding options are now fully vested as of the date of the executed agreements. In accordance with ASC Topic 718, Compensation – Stock Compensation, the Company does not expect to record an incremental charge related to the accelerated vesting of unvested options that do not contain a performance condition since the modification did not result in incremental value. The Company has estimated the potential compensation cost to be recorded upon consummation of an IPO associated with all vested options, including those modified to accelerate vesting, is approximately $7.5 million as of September 29, 2013.

On August 1, 2013, the Company modified stock option agreements for all current employees and the Company’s Founding Chairman to revise the exercise price of $14.00 per option on 718,593 options to an exercise price of $10.59 per option and issued 122,271 stock options to the same Founding Chairman at an exercise price of $10.59 per option. All of these options contain a performance condition that restricts the option holders’ ability to exercise vested options until the consummation of an IPO under the Securities Act or at the discretion of the Company’s board of directors. In accordance with ASC Topic 718, Compensation – Stock Compensation, the Company expects to record a charge of approximately $0.7 million during the fourth quarter of 2013 related to the incremental value associated with the reduced exercise price at the time performance conditions have been met and a charge of approximately $0.6 million associated with options issued to the Founding Chairman at the time performance conditions have been met.

On August 8, 2013, the Company entered into an employment agreement with Aylwin Lewis, its Chief Executive Officer and President. The agreement includes a compensation arrangement consistent with his current compensation arrangement as well as the grant of 227,187 options under the 2004 Equity Plan, which are exercisable without restriction and vest over a period of four years. In accordance with ASC Topic 718, Compensation – Stock Compensation, fair value of the options was determined using the Black-Scholes-Merton option pricing model. The Company used the following assumptions for purposes of valuing these option grants: common stock fair value of $10.59 per share; expected life of options—seven years; volatility—48.0%; risk-free interest rate—1.3%; and dividend yield—0.0%. The Company used the simplified method for determining the expected life of the options.

On August 20, 2013, the Company issued 81,064 replacement stock options to Bryant Keil, under the 2004 Equity Plan, which are exercisable without restriction and vested immediately. The fair value of the options was determined using the Black-Scholes-Merton option pricing model. The Company used the following assumptions for purposes of valuing these option grants: common stock fair value of $10.59 per share; expected life of the options – five years; volatility – 48.0%; risk-free rate – 1.6%; and dividend yield – 0.0%. The Company used the simplified method for determining the expected life of the options. In accordance with ASC Topic 718,Compensation – Stock Compensation, the Company recorded a charge of $0.4 million related to these options.

Stock-based Compensation

In accordance with ASC Topic 718, Compensation—Stock Compensation, stock-based compensation is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the requisite employee service period (generally the vesting period of the grant). For those options that are exercisable without restriction, the Company recognized $2.4 million and $2.3 million for the 39 weeks ended September 29, 2013 and for the 39 weeks ended September 23, 2012, respectively, with a corresponding increase to additional paid-in-capital. As of September 29, 2013, and September 23, 2012, the unrecognized stock compensation expense was $1.2 million and $2.1 million, respectively, which will be recognized through fiscal year 2018. The Company records stock based compensation expense within general and administrative expenses in the consolidated statements of operations.

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 29, 2013
Subsequent Events [Abstract]
Subsequent Events	(8) Subsequent Events Initial Public Offering On October 9, 2013, the Company completed an initial public offering of 8,625,000 shares of common stock at a price of $14.00 per share, which included 1,125,000 shares of common stock issued upon the exercise in full of the underwriters’ option to purchase additional shares. The Company sold 8,474,869 shares of common stock and certain stockholders sold 150,131 shares of common stock. The Company received net proceeds from the offering of approximately $108.8 million, after deducting the underwriting discount and other estimated offering expenses. The Company did not receive any proceeds from the shares sold by the selling stockholders. Because the initial public offering was a qualified IPO, as defined, all outstanding preferred stock automatically converted into common stock upon the closing of the offering. All dividends accrued on the shares of preferred stock were forfeited at the time of such conversion. Additionally, all outstanding options to purchase non-voting common stock of the Company automatically converted into options to purchase common stock upon the closing of the initial public offering. Dividend Payment in Connection with Initial Public Offering The Company used the net proceeds received from the sale of its shares in the initial public offering to pay a previously declared cash dividend of approximately $49.9 million on shares outstanding on October 8, 2013. Debt Repayment in Connection with Initial Public Offering On October 24, 2013, the Company used $14.0 million of the net proceeds from the sale of its shares in the initial public offering to repay the amounts outstanding under the senior credit facility. Option Grants in Connection with Initial Public Offering Under the 2013 Long-Term Incentive Plan, the Company granted options to purchase 395,000 shares of the Company’s common stock, effective as of the closing of the Company’s initial public offering, to certain senior leaders. Such options have an exercise price equal to the initial public offering price of $14.00 per share and have a four year vesting period. The fair value of the options was determined using the Black-Scholes-Merton option pricing model. The Company used the following assumptions for purposes of valuing these option grants: common stock fair value of $14.00 per share; expected life of options—seven years; volatility—48.3%; risk-free interest rate—2.1%; and dividend yield—0.0%. The Company used the simplified method for determining the expected life of the options. The Company was unable to calculate specific stock price volatility as a private company, and as such, the Company used a blended volatility rate for comparable publicly traded companies.

Organization and Other Matters (Policies)	9 Months Ended
Organization and Other Matters (Policies)	Sep. 29, 2013
Accounting Policies [Abstract]
Business	*Business* Potbelly Corporation (the “Company” or “Potbelly”), through its wholly owned subsidiary, Potbelly Sandwich Works LLC, operates Potbelly Sandwich Works sandwich shops in 18 states and the District of Columbia. As of December 30, 2012 and September 29, 2013, the Company had 264 and 288 company-operated shops, respectively. During fiscal year 2012, the Company opened 31 new shops and closed one shop. During the 39 weeks ended September 29, 2013, the Company opened 25 new shops and closed one shop. The Company also sells and administers franchises of new Potbelly Sandwich Works sandwich shops. The first domestic and international franchise locations administered by the Company opened during February 2011. As of the fiscal year ended 2012, five franchised shops were in operation domestically and ten franchised shops were in operation internationally. As of September 29, 2013, seven franchised shops were in operation in domestic locations and twelve franchised shops were in operation internationally. The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Potbelly Corporation and its subsidiaries and the notes thereto included in the Company’s prospectus dated October 3, 2013, filed pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”), with the Securities and Exchange Commission (“SEC”) on October 4, 2013. The unaudited condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the SEC regarding interim financial reporting. The December 30, 2012 condensed consolidated balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of December 30, 2012 and September 29, 2013, its statement of operations for the 13 weeks and 39 weeks ended September 23, 2012 and September 29, 2013 and its statement of cash flows for the 39 weeks ended September 23, 2012 and September 29, 2013 have been included. The consolidated statements of operations for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. The Company does not have any components of other comprehensive income (loss) recorded within its consolidated financial statements, and, therefore, does not separately present a statement of comprehensive income (loss) in its consolidated financial statements.
Principles of Consolidation	*Principles of Consolidation* The unaudited condensed consolidated financial statements include the accounts of Potbelly Corporation; its wholly owned subsidiary, Potbelly Illinois, Inc. (“PII”); PII’s wholly owned subsidiaries, Potbelly Franchising, LLC, Potbelly Sandwich Works, LLC (“LLC”) and 17 of LLC’s wholly owned subsidiaries, collectively, the “Company.” All significant intercompany balances and transactions have been eliminated in consolidation. For the Company’s consolidated joint venture, non-controlling interest represents the non-controlling partner’s share of the assets, liabilities and operations related to the joint venture investment in Potbelly Airport II Boston, LLC, related to one shop located in the Boston Logan International Airport. The Company owns a seventy-five percent interest in this consolidated joint venture.
Use of Estimates	*Use of Estimates* The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions, primarily related to long-lived assets, income taxes, stock-based compensation and common stock equity valuations, that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Fiscal Year	*Fiscal Year* The Company uses a 52/53-week fiscal year that ends on the last Sunday of the calendar year. Approximately every six or seven years a 53rd week is added. Fiscal 2012 consisted of 53 weeks. The fiscal quarters ended September 23, 2012 and September 29, 2013 each consisted of 13 weeks and the fiscal year-to-date periods ended September 23, 2012 and September 29, 2013 each consisted of 39 weeks.
Stock based Compensation	In accordance with ASC Topic 718, Compensation—Stock Compensation, stock-based compensation is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the requisite employee service period (generally the vesting period of the grant). For those options that are exercisable without restriction, the Company recognized $2.4 million and $2.3 million for the 39 weeks ended September 29, 2013 and for the 39 weeks ended September 23, 2012, respectively, with a corresponding increase to additional paid-in-capital. As of September 29, 2013, and September 23, 2012, the unrecognized stock compensation expense was $1.2 million and $2.1 million, respectively, which will be recognized through fiscal year 2018. The Company records stock based compensation expense within general and administrative expenses in the consolidated statements of operations.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References + Details

- Definition

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

+ References + Details

Earnings per share (Tables)

9 Months Ended

Sep. 29, 2013

Earnings Per Share [Abstract]

Schedule of the Calculation of Weighted Average Common Shares Outstanding for Basic and Diluted Earnings per Share Available to Common Stockholders


	13 Weeks Ended						39 Weeks Ended
	September 29, 2013			September 23, 2012			September 29, 2013			September 23, 2012
Calculation of undistributed (loss) for basic and diluted shares:
Net income attributable to Potbelly Corporation	$	2,165		$	2,548		$	4,941		$	5,571
Less: Dividend declared to common and preferred stockholders		(49,854	)		—			(49,854	)		—
Less: Accretion of redeemable convertible preferred stock to maximum redemption value		(4,796	)		(5,545	)		(15,097	)		(13,887	)

Undistributed loss for basic and diluted shares	$	(52,485	)	$	(2,997	)	$	(60,010	)	$	(8,316	)

Allocation of undistributed(loss) to participating securities:
Common shares	$	(52,485	)	$	(2,997	)	$	(60,010	)	$	(8,316	)
Redeemable convertible preferred shares		—			—			—			—

Undistributed (loss) income	$	(52,485	)	$	(2,997	)	$	(60,010	)	$	(8,316	)

Weighted average common shares outstanding-basic		4,268,953			3,972,873			4,250,819			3,972,873
Plus: Effect of potential stock options exercise		—			—			—			—
Plus: Effect of potential warrant exercise		—			—			—			—

Weighted average common shares outstanding-diluted		4,268,953			3,972,873			4,250,819			3,972,873

Income (loss) per share available to common stockholders-basic	$	(12.29	)	$	(0.75	)	$	(14.12	)	$	(2.09	)
Income (loss) per share available to common stockholders-diluted	$	(12.29	)	$	(0.75	)	$	(14.12	)	$	(2.09	)
Potentially dilutive shares that are considered anti-dilutive:
Common share options		4,744,664			4,446,049			4,744,664			4,446,049
Warrants		241,704			378,996			241,704			378,996

Long-term debt (Tables)

9 Months Ended

Sep. 29, 2013

Debt Disclosure [Abstract]

Summary of Long Term Debt

Long-term debt consisted of the following (in thousands):


	September 29, 2013		December 30, 2012
Senior credit facility (a)	$	14,000	$	14,000
Note payable (b)		1,110		1,169

Total long-term debt		15,110		15,169
Less: Current portion		14,074		74

Long-term debt, net of current portion	$	1,036	$	15,095

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Capital Stock and Warrants (Tables)

9 Months Ended

Sep. 29, 2013

Equity [Abstract]

Summary of Issued Warrants

A roll-forward of the Company’s issued warrants as of September 29, 2013 is set forth below:


Unexercised Warrants	Number of Warrants
Outstanding—December 25, 2011		378,996
Issuance of warrants at $8.16 per share (a)		241,704
Exercise of warrants at $5.46 per share		(261,104	)

Outstanding—December 30, 2012		359,596
Exercise of warrants at $0.01 per share		(117,892	)

Outstanding—September 29, 2013		241,704

(a)

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details

Stock Options (Tables)

9 Months Ended

Sep. 29, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Under Plans and Agreement

Activity under the Plans and the Agreement is as follows:


Options	Shares (Thousands)			Weighted Average Exercise Price		Aggregate Intrinsic Value (Thousands)		Weighted Average Remaining Term (Years)
Outstanding—December 25, 2011		4,261			9.19	$	2,229		6.34
Granted		504			8.65
Exercised		—			—
Canceled		(552	)		7.67

Outstanding—December 30, 2012		4,213			9.30	$	5,348		5.93
Granted		848			10.06
Exercised		—			—
Canceled		(316	)		8.40

Outstanding—September 29, 2013		4,745			8.99	$	15,434		6.22

Organization and Other Matters - Additional Information (Detail)	1 Months Ended
	Oct. 09, 2013 shares	Sep. 29, 2013 State Store	Dec. 30, 2012 Store
Nature Of Business And Basis Of Presentation [Line Items]
Number of sandwich works and shops operation states \| State		18
IPO [Member] \| Subsequent Event [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Initial public offering of common stock \| shares	8,625,000
Initial public offering period	On October 9, 2013, the Company completed an initial public offering of 8,625,000 shares of common stock.
Company Operated Shops [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops		288	264
Opened Shops [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops		25	31
Closed Shops [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops		1	1
First Franchise Locations [Member] \| Domestic Operations [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops		7	5
First Franchise Locations [Member] \| International Operation [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops		12	10

Earnings Per Share - Schedule of the Calculation of Weighted Average Common Shares Outstanding for Basic and Diluted Earnings per Share Available to Common Stockholders (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013	Sep. 23, 2012
Calculation of undistributed (loss) for basic and diluted shares:
Net income attributable to Potbelly Corporation	$ 2,165,000	$ 2,548,000	$ 4,941,000	$ 5,571,000
Less: Dividend declared to common and preferred stockholders	(49,854,000)		(49,854,000)
Less: Accretion of redeemable convertible preferred stock to maximum redemption value	(4,796,000)	(5,545,000)	(15,097,000)	(13,887,000)
Undistributed loss for basic and diluted shares	(52,485,000)	(2,997,000)	(60,010,000)	(8,316,000)
Allocation of undistributed (loss) to participating securities:
Undistributed (loss) income	$ (52,485)	$ (2,997)	$ (60,010)	$ (8,316)
Weighted average common shares outstanding-basic	4,268,953	3,972,873	4,250,819	3,972,873
Plus: Effect of potential stock options exercise
Plus: Effect of potential warrant exercise
Weighted average common shares outstanding-diluted	4,268,953	3,972,873	4,250,819	3,972,873
Income (loss) per share available to common stockholders-basic	$ (12.29)	$ (0.75)	$ (14.12)	$ (2.09)
Income (loss) per share available to common stockholders-diluted	$ (12.29)	$ (0.75)	$ (14.12)	$ (2.09)
Common Share Options [Member]
Allocation of undistributed (loss) to participating securities:
Potentially dilutive shares that are considered anti-dilutive	4,744,664	4,446,049	4,744,664	4,446,049
Common Stock [Member]
Allocation of undistributed (loss) to participating securities:
Undistributed (loss) income	$ (52,485)	$ (2,997)	$ (60,010)	$ (8,316)
Warrant [Member]
Allocation of undistributed (loss) to participating securities:
Potentially dilutive shares that are considered anti-dilutive	241,704	378,996	241,704	378,996

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013	Sep. 23, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 905	$ 84	$ 2,792	$ 765
Pre-tax income	$ 3,079	$ 2,637	$ 7,757	$ 6,301
Effective tax rate			36.00%	12.10%

Long-term Debt - Summary of Long Term Debt (Detail) - USD ($) $ in Thousands	Sep. 29, 2013	Dec. 30, 2012
Debt Disclosure [Abstract]
Senior credit facility	$ 14,000	$ 14,000
Note payable	1,110	1,169
Total long-term debt	15,110	15,169
Less: Current portion	14,074	74
Long-term debt, net of current portion	$ 1,036	$ 15,095

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Long-term Debt - Additional Information (Detail) $ in Thousands	1 Months Ended		9 Months Ended
	Oct. 24, 2013 USD ($)	Sep. 21, 2012 USD ($)	Sep. 29, 2013 USD ($)	Sep. 23, 2012 USD ($)	Dec. 30, 2012
Note Payable [Member]
Debt Instrument [Line Items]
Interest rate on notes payable under effective interest rate method			6.00%	6.00%
Interest expense on note payable			$ 54	$ 57
JPMorgan Chase Bank, N.A. [Member] \| Senior credit facility [Member]
Debt Instrument [Line Items]
Revolving credit facility agreement term period		5 years
Revolving credit facility agreement expiration date			Sep. 30, 2017
Borrowings allowed to fund capital expenditures		$ 35,000
Maximum leverage ratio		2.25
Minimum debt service coverage ratio		1.5
Federal funds effective rate plus			0.50%
Federal funds base rate			The base rate is the higher of the prime rate and the federal funds rate, plus 0.50%.
Weighted average interest rate			1.35%		1.35%
Subsequent Event [Member]
Debt Instrument [Line Items]
Public offering proceeds used for repayments of debt	$ 14,000

Capital Stock and Warrants - Additional Information (Detail) $ in Thousands	1 Months Ended		9 Months Ended
	Aug. 31, 2013 USD ($) shares	Feb. 26, 2013 shares	Sep. 29, 2013 USD ($) shares	Sep. 23, 2012 USD ($)	Dec. 30, 2012 USD ($) shares
Class Of Warrant And Capital Stock [Line Items]
Capital stock, authorized			52,683,632		52,683,632
Common stock, authorized			35,500,000		35,500,000
Common stock, issued			4,351,869		4,233,977
Common stock, outstanding			4,351,869		4,233,977
Preferred stock, authorized			17,183,632		17,183,632
Preferred stock, issued			16,086,375		16,086,375
Preferred stock, outstanding			16,086,375		16,086,375
Preferred stock dividend rate			6.00%
Minimum percentage of liquidation value to be paid			110.00%
Percentage of liquidation value to be paid			Dividends were cumulative, but were payable only upon their redemption or the occurrence of a significant event that would result in a distribution to their holders of less than 110% of the shares' liquidation value
Terms of non-voting Common stock conversion basis ratio			The terms of the non-voting common stock provided that all shares of non-voting common stock would convert into voting common stock on a 1:1 basis immediately prior to the closing of an underwritten IPO or sale of the Company.
Common stock conversion ratio			1
Modification of warrants issued	241,704
Recognized stock compensation expense \| $	$ 100		$ 2,370	$ 2,320
Cash dividend declared \| $			$ 49,854
Date of cash dividend paid			Oct. 09, 2013
Board Of Directors [Member]
Class Of Warrant And Capital Stock [Line Items]
Stock options issued		59,865
Non-voting Common Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Common stock, authorized			500,000		500,000
Common stock, issued			0
Series A Preferred Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Preferred stock, authorized			4,197,377		4,197,377
Preferred stock, issued			3,697,377
Preferred stock, outstanding			3,697,377
Series B Preferred Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Preferred stock, authorized			3,375,221		3,375,221
Preferred stock, issued			3,290,294
Preferred stock, outstanding			3,290,294
Series C Preferred Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Preferred stock, authorized			1,666,668		1,666,668
Preferred stock, issued			1,646,595
Preferred stock, outstanding			1,646,595
Series D Preferred Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Preferred stock, authorized			1,250,000		1,250,000
Preferred stock, issued			1,250,000
Preferred stock, outstanding			1,250,000
Common stock conversion ratio		1.03
Series E Preferred Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Preferred stock, authorized			4,194,366		4,194,366
Preferred stock, issued			4,194,366
Preferred stock, outstanding			4,194,366
Common stock conversion ratio		1.03
Series F Preferred Stock [Member]
Class Of Warrant And Capital Stock [Line Items]
Preferred stock, authorized			2,500,000		2,500,000
Preferred stock, issued			2,007,743
Preferred stock, outstanding			2,007,743

Capital Stock and Warrants - Summary of Issued Warrants (Detail) - shares	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Dec. 30, 2012
Equity [Abstract]
Unexercised Warrants Outstanding	359,596	378,996
Issuance of warrants		241,704
Less: Exercise of warrants	(117,892)	(261,104)
Unexercised Warrants Outstanding	241,704	359,596

Capital Stock and Warrants - Summary of Issued Warrants (Parenthetical) (Detail)		12 Months Ended
	Sep. 19, 2001 $ / Warrant shares	Dec. 30, 2012 $ / shares $ / Warrant	Sep. 29, 2013 $ / Warrant
Equity [Abstract]
Number of shares convertible under warrant \| shares	200,000
Exercise price of warrants		$ 8.16
Exercise price of warrants \| $ / Warrant	5.00	5.46	0.01
Common stock fair value		$ 8.16
Fair value assumption, expected life of warrants		5 years
Volatility		53.00%
Fair value assumption, risk-free interest rate		1.10%
Fair value assumption, dividend yield		0.00%
Common stock warrant, expiration date	Sep. 01, 2011

Stock Options - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands						1 Months Ended	2 Months Ended	9 Months Ended		12 Months Ended
	Aug. 20, 2013	Aug. 08, 2013	Aug. 01, 2013	Jul. 29, 2013	Feb. 26, 2013	Aug. 31, 2013	Sep. 29, 2013	Sep. 29, 2013	Sep. 23, 2012	Dec. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant								848,000		504,000
Recognized stock compensation expense						$ 100		$ 2,370	$ 2,320
Unrecognized stock compensation expense							$ 1,200	$ 1,200	$ 2,100
Unrecognized stock compensation expense, recognition period								Through 2018
Common Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance							500,000	500,000
Employees And Board Members [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price per option			$ 14.00
Employees And Board Members [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant			718,593
Board Of Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price per option			$ 10.59
Board Of Director [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant			122,271
Non-voting Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued to key executive								500,000
Scenario, Forecast [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated stock based compensation expense								$ 700
Scenario, Forecast [Member] \| Board Of Director [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated stock based compensation expense								$ 600
2001 and 2004 Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of options outstanding, lower limit								$ 7
Exercise price of options outstanding, higher limit								$ 14
2001 and 2004 Equity Incentive Plans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period from the date of grant								10 years
Options issued and outstanding, last expiration date								Dec. 31, 2023
Options vesting period								5 years
2001 Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance							746,749	746,749
2004 Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance							4,289,994	4,289,994		3,960,998
2004 Equity Plan [Member] \| Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant				278,272
Estimated stock based compensation expense								$ 7,500
2004 Equity Plan [Member] \| Management [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant				141,341
2004 Equity Plan [Member] \| Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant	81,064
Method used to determine fair value of the options	Black-Scholes-Merton option pricing model
Common stock fair value	$ 10.59
Expected life of options	5 years
Volatility	48.00%
Risk-free interest rate	1.56%
Dividend yield	0.00%
Recognized stock compensation expense	$ 400
2004 Equity Plan [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant		227,187
Options vesting period		4 years
Method used to determine fair value of the options		Black-Scholes-Merton option pricing model
Common stock fair value		$ 10.59
Expected life of options		7 years
Volatility		48.00%
Risk-free interest rate		1.30%
Dividend yield		0.00%
February 26, 2013 [Member] \| Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant					59,865
Method used to determine fair value of the options					Black-Scholes-Merton option pricing model
Common stock fair value					$ 9.47
Expected life of options					5 years
Volatility					46.60%
Risk-free interest rate					0.80%
Dividend yield					0.00%
2013 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for grant							0
Shares of common stock reserved for issuance							1,500,000	1,500,000

Stock Options - Summary of Activity Under Plans and Agreement (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding shares, Granted	848	504
Options Outstanding shares, Exercised
Options Outstanding shares, Canceled	(316)	(552)
Options Outstanding shares, ending balance	4,745	4,213	4,261
Options outstanding weighted average exercise price, Granted	$ 10.06	$ 8.65
Options outstanding weighted average exercise price, Exercised
Options outstanding weighted average exercise price, Canceled	8.40	7.67
Options outstanding weighted average exercise price, ending balance	$ 8.99	$ 9.30	$ 9.19
Options Outstanding Aggregate Intrinsic value	$ 15,434	$ 5,348	$ 2,229
Option Outstanding Weighted Average Remaining Term	6 years 2 months 19 days	5 years 11 months 5 days	6 years 4 months 2 days

Subsequent Event - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		2 Months Ended	9 Months Ended	12 Months Ended
	Oct. 24, 2013	Oct. 09, 2013	Sep. 29, 2013	Sep. 29, 2013	Dec. 30, 2012	Oct. 08, 2013	Sep. 23, 2012
Subsequent Event [Line Items]
Cash dividend paid from proceeds from IPO			$ 49,854	$ 49,854
Number of shares available for grant				848,000	504,000
2013 Long-Term Incentive Plan [Member]
Subsequent Event [Line Items]
Number of shares available for grant			0
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividend paid from proceeds from IPO						$ 49,900
Public offering proceeds used for repayments of debt	$ 14,000
Subsequent Event [Member] \| 2013 Long-Term Incentive Plan [Member]
Subsequent Event [Line Items]
Number of shares available for grant		395,000
Vesting period		4 years
Fair value of option grant		$ 14.00
Expected life of option		7 years
Expected Volatility Rate		48.30%
Risk free interest rate		2.01%
Dividend yield		0.00%
IPO [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Public offering shares of common stock		8,625,000
Common stock issued, price per share		$ 14.00
Share sold by company		8,474,869
Net proceeds from IPO		$ 108,800
IPO [Member] \| Subsequent Event [Member] \| Underwritten Public Offering [Member]
Subsequent Event [Line Items]
Public offering shares of common stock		1,125,000
IPO [Member] \| Subsequent Event [Member] \| Shareholders' Equity [Member]
Subsequent Event [Line Items]
Share sold by stock holders through public offering		150,131