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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 30, 2014	Apr. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Trading Symbol	PBPB
Entity Registrant Name	Potbelly Corporation
Entity Central Index Key	0001195734
Current Fiscal Year End Date	--12-28
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		29,255,472

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 30, 2014	Dec. 29, 2013
Current assets
Cash and cash equivalents	$ 69,547	$ 69,579
Accounts receivable, net of allowances of $11 and $6 as of March 30, 2014 and December 29, 2013, respectively	3,862	2,991
Inventories	2,182	2,263
Prepaid expenses and other current assets	8,553	6,965
Total current assets	84,144	81,798
Property and equipment, net	79,007	78,983
Intangible assets, net	3,404	3,404
Goodwill	1,428	1,428
Deferred income taxes	17,661	17,297
Deferred expenses, net and other assets	3,141	3,170
Total assets	188,785	186,080
Current liabilities
Accounts payable	3,424	2,078
Accrued expenses	17,382	16,337
Accrued income taxes	29	216
Current portion of long-term debt	74	74
Total current liabilities	20,909	18,705
Long-term debt, net of current portion	997	1,018
Deferred rent and landlord allowances	12,632	12,288
Other long-term liabilities	770	796
Total liabilities	35,308	32,807
Equity
Common stock, $0.01 par value-authorized, 200,000,000 shares; issued and outstanding 29,151,428 and 29,148,029 shares as of March 30, 2014, and December 29, 2013, respectively	291	291
Warrants	909	909
Additional paid-in-capital	383,573	383,077
Accumulated deficit	(231,533)	(231,232)
Total stockholders' equity	153,240	153,045
Non-controlling interest	237	228
Total equity	153,477	153,273
Total liabilities and equity	$ 188,785	$ 186,080

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 30, 2014	Dec. 29, 2013
Condensed Consolidated Balance Sheet [Abstract]
Allowances on accounts receivable	$ 11	$ 6
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	200,000,000	200,000,000
Common stock, issued	29,151,428	29,148,029
Common stock, outstanding	29,151,428	29,148,029

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Revenues
Sandwich shop sales, net	$ 73,523	$ 68,541
Franchise royalties and fees	358	203
Total revenues	73,881	68,744
Sandwich shop operating expenses
Cost of goods sold, excluding depreciation	21,086	19,993
Labor and related expenses	21,460	19,791
Occupancy expenses	9,979	8,719
Other operating expenses	8,158	7,211
General and administrative expenses	7,822	8,182
Depreciation expense	4,717	4,380
Pre-opening costs	252	290
Impairment and loss on disposal of property and equipment	848	26
Total expenses	74,322	68,592
(Loss) income from operations	(441)	152
Interest expense	42	112
Other expense		2
(Loss) income before income taxes	(483)	38
Income tax (benefit) expense	(191)	16
Net (loss) income	(292)	22
Net income attributable to non-controlling interest	9	4
Net (loss) income attributable to Potbelly Corporation	(301)	18
Accretion of redeemable convertible preferred stock to maximum redemption value		(7,396)
Net (loss) attributable to common stockholders	$ (301)	$ (7,378)
Net (loss) per common share attributable to common stockholders:
Basic	$ (0.01)	$ (1.74)
Diluted	$ (0.01)	$ (1.74)
Weighted average shares outstanding:
Basic	29,150,824	4,238,624
Diluted	29,150,824	4,238,624

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Series A [Member]	Series B [Member]	Series C [Member]	Series D [Member]	Series E [Member]	Series F [Member]	Redeemable Convertible Preferred Stock [Member]	Common Stock [Member]	Warrants [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 30, 2012	$ (168,728)	$ 52,796	$ 46,983	$ 23,715	$ 18,319	$ 79,861	$ 28,669	$ 250,343	$ 42	$ 1,552		$ (170,518)	$ 196
Beginning Balance, Preferred Shares at Dec. 30, 2012		3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743	16,086,375
Beginning Balance, Common Shares at Dec. 30, 2012									4,233,977
Net income	22											18	4
Beneficial Conversion Charge											$ 50	(50)
Exercise of stock warrants										(45)
Exercise of stock warrants, additional paid in capital											45
Exercise of stock warrants, Shares									8
Amortization of stock-based compensation	708										708
Changes in redemption value of preferred stock	(7,396)	$ 1,197	$ 1,065	$ 537	$ 424	$ 3,523	$ 650	$ 7,396			(803)	(6,593)
Ending Balance at Mar. 31, 2013	(175,394)	$ 53,993	$ 48,048	$ 24,252	$ 18,743	$ 83,384	$ 29,319	$ 257,739	$ 42	1,507		(177,143)	200
Ending Balance, Preferred Shares at Mar. 31, 2013		3,697,377	3,290,294	1,646,595	1,250,000	4,194,366	2,007,743	16,086,375
Ending Balance, Common Shares at Mar. 31, 2013									4,233,985
Beginning Balance at Dec. 29, 2013	$ 153,273								$ 291	909	383,077	(231,232)	228
Beginning Balance, Common Shares at Dec. 29, 2013	29,148,029								29,148,029
Net income	$ (292)											(301)	9
Exercise of stock options	$ 8										8
Exercise of stock options, Shares	3,000								3,399
Amortization of stock-based compensation	$ 488										488
Ending Balance at Mar. 30, 2014	$ 153,477								$ 291	$ 909	$ 383,573	$ (231,533)	$ 237
Ending Balance, Common Shares at Mar. 30, 2014	29,151,428								29,151,428

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (292)	$ 22
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	4,717	4,380
Deferred income tax	(364)	10
Deferred rent and landlord allowances	344	(32)
Amortization of stock compensation expense	488	708
Asset impairment, store closure and disposal of property and equipment	848	26
Amortization of debt issuance costs	18	11
Changes in operating assets and liabilities:
Accounts receivable, net	(871)	(126)
Inventories	81	(78)
Prepaid expenses and other assets	(1,641)	(269)
Accounts payable	1,324	397
Accrued and other liabilities	1,864	2,866
Net cash provided by operating activities	6,516	7,915
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(6,536)	(6,834)
Net cash (used in) investing activities	(6,536)	(6,834)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	8
Payment of costs associated with initial public offering		(369)
Payments on note payable	(20)	(19)
Net cash (used in) financing activities	(12)	(388)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(32)	693
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	69,579	22,595
CASH AND CASH EQUIVALENTS AT END OF PERIOD	69,547	23,288
Supplemental cash flow information:
Income taxes paid	356	103
Interest paid	42	92
Supplemental non-cash investing and financing activities:
Unpaid liability for purchases of property and equipment	$ 1,626	2,118
Accretion of redeemable convertible preferred stock to maximum redemption value		$ 7,396

Organization and Other Matters	3 Months Ended
Organization and Other Matters	Mar. 30, 2014
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 21 states and the District of Columbia. As of March 30, 2014, the Company had 305 company-operated shops. During the 13 weeks ended March 30, 2014, the Company opened nine new company-operated shops and closed no shops. 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 March 30, 2014, twelve franchised shops were in operation in domestic locations and thirteen franchised shops were in operation internationally. *Basis of Presentation* 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 Annual Report on Form 10-K for the year ended December 29, 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. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations. 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 29, 2013 and March 30, 2014, its statement of operations for the 13 weeks ended March 31, 2013 and March 30, 2014 and its statement of cash flows for the 13 weeks ended March 31, 2013 and March 30, 2014 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* 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 five or six years a 53rd week is added. Fiscal 2013 and 2014 each consist of 52 weeks. The fiscal quarters ended March 31, 2013 and March 30, 2014 each consisted of 13 weeks.

- Definition

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

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+ Details

Fair Value Measurements	3 Months Ended
Fair Value Measurements	Mar. 30, 2014
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 balances. 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. Shop-level assets are grouped at the individual shop-level for the purpose of the impairment assessment. Recoverability of an asset is measured by a comparison of the carrying amount of an asset 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. 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. After performing a periodic review of our shops, it was determined that indicators of impairment were present for certain shops as a result of continued underperformance of shop profitability. We performed an impairment analysis related to these shops and recorded an impairment charge of $0.8 million related to the excess of the carrying amounts recorded on our balance sheet over the identified shops’ estimated fair values as of March 30, 2014.

- 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

3 Months Ended

Mar. 30, 2014

Earnings Per Share [Abstract]

Earnings per share

(3) Earnings per share

Basic income (loss) per common share attributable to common stockholders is calculated using the weighted average number of common shares outstanding for the period. For the 13 weeks ended March 31, 2013, diluted income (loss) per common share attributable to common stockholders was 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. The Company’s redeemable convertible preferred stock were 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 were 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. For the 13 weeks ended March 31, 2013, the dilutive securities did not include stock options awarded to employees that had a performance condition requiring the completion of an initial public offering of common stock, as that performance condition was not satisfied at the reporting date and the holders of these options had no rights in our undistributed earnings until that time. For the 13 weeks ended March 30, 2014, diluted income (loss) per common share attributable to common stockholders was calculated using income available to common shareholders divided by diluted weighted-average shares of common stock outstanding during the period.


	13 Weeks Ended
	March 30, 2014			March 31, 2013
Calculation of undistributed (loss) for basic and diluted shares:
Net (loss) income attributable to Potbelly Corporation	$	(301	)	$	18
Less: Accretion of redeemable convertible preferred stock to maximum redemption value		—			(7,396	)

Undistributed (loss) for basic and diluted shares		(301	)	$	(7,378	)

Allocation of undistributed (loss) to participating securities:
Common shares	$	(301	)	$	(7,378	)
Redeemable convertible preferred shares		—			—

Undistributed (loss)	$	(301	)	$	(7,378	)

Weighted average common shares outstanding-basic		29,150,824			4,238,624
Plus: Effect of potential stock options exercise		—			—
Plus: Effect of potential warrant exercise		—			—

Weighted average common shares outstanding-diluted		29,150,824			4,238,624

(Loss) per share available to common stockholders-basic	$	(0.01	)	$	(1.74	)
(Loss) per share available to common stockholders-diluted	$	(0.01	)	$	(1.74	)
Potentially dilutive shares that are considered anti-dilutive:
Common share options		5,238,508			4,418,825
Warrants		241,704			241,704

For the 13 weeks ended March 31, 2013 and March 30, 2014, the Company’s potential common stock instruments such as common share options and warrants were not included in the computation of diluted (loss) per common share as the effect of including these shares in the calculation would have been anti-dilutive.

Income Taxes	3 Months Ended
Income Taxes	Mar. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	(4) Income Taxes The Company recognized an income tax benefit of $0.2 million on pre-tax loss of $0.5 million, or an effective tax rate of 39.5%, for the 13 weeks ended March 30, 2014, compared to income tax expense of $16 thousand on pre-tax income of $38 thousand, or an effective tax rate of 42.1%, for the 13 weeks ended March 31, 2013. 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 decrease in the effective tax rate primarily relates to the Company recognizing certain federal tax credits, which were not recognized in the comparable prior period.

Capital Stock	3 Months Ended
Capital Stock	Mar. 30, 2014
Equity [Abstract]
Capital Stock	(5) Capital Stock On October 9, 2013, the Company completed an initial public offering. Effective upon the closing of such offering, all shares of preferred stock and non-voting common stock converted into common stock. 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. Each share of common stock has the same relative rights and was identical in all respects to each other share of common stock. Each holder of shares of common stock is entitled to one vote for each share held by such holder at all meetings of stockholders.

- 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.

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+ Details

Stock Options

3 Months Ended

Mar. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Options

(6) Stock Options

On March 6, 2014, the Company issued 247,767 stock options under the 2013 Long-Term Incentive Plan to eligible employees and key executives. The fair value of the options was determined using the Black-Scholes option pricing model. The Company used the following assumptions for purposes of valuing these option grants: common stock fair value of $20.53 per share; expected life of options – seven years; volatility- 49.61%; risk-free interest rate – 1.13%; and dividend yield – 0.00%. The Company used the simplified method for determining the expected life of the options. Due to the lack of historical data as a newly public company, the Company calculated the specific stock price volatility using a blended volatility rate based on comparable publicly traded companies.

A summary of activity for the thirteen weeks ended March 30, 2014 is as follows:


Options	Shares (Thousands)			Weighted Average Exercise Price		Aggregate Intrinsic Value (Thousands)		Weighted Average Remaining Term (Years)
Outstanding—December 29, 2013		5,030		$	9.41	$	78,575		6.31

Granted		248			20.53
Exercised		(3	)		8.38
Canceled		(36	)		12.67

Outstanding—March 30, 2014		5,239			9.91	$	41,564		6.23

Exercisable—March 30, 2014		3,921			13.24	$	38,203		8.32

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). The Company recognized $0.5 million and $0.7 million for the 13 weeks ended March 30, 2014 and March 31, 2013, respectively, with a corresponding increase to additional paid-in-capital. As of March 30, 2014 and March 31, 2013, the unrecognized stock compensation expense was $7.1 million and $0.9 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	3 Months Ended
Subsequent Events	Mar. 30, 2014
Subsequent Events [Abstract]
Subsequent Events	(7) Subsequent Events The Company has evaluated subsequent events and found there to be no events requiring recognition or disclosure through the date of issuance of this report.

Organization and Other Matters (Policies)	3 Months Ended
Organization and Other Matters (Policies)	Mar. 30, 2014
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 21 states and the District of Columbia. As of March 30, 2014, the Company had 305 company-operated shops. During the 13 weeks ended March 30, 2014, the Company opened nine new company-operated shops and closed no shops. 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 March 30, 2014, twelve franchised shops were in operation in domestic locations and thirteen franchised shops were in operation internationally.
Basis of Presentation	*Basis of Presentation* 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 Annual Report on Form 10-K for the year ended December 29, 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. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations. 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 29, 2013 and March 30, 2014, its statement of operations for the 13 weeks ended March 31, 2013 and March 30, 2014 and its statement of cash flows for the 13 weeks ended March 31, 2013 and March 30, 2014 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 five or six years a 53rd week is added. Fiscal 2013 and 2014 each consist of 52 weeks. The fiscal quarters ended March 31, 2013 and March 30, 2014 each consisted of 13 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). The Company recognized $0.5 million and $0.7 million for the 13 weeks ended March 30, 2014 and March 31, 2013, respectively, with a corresponding increase to additional paid-in-capital. As of March 30, 2014 and March 31, 2013, the unrecognized stock compensation expense was $7.1 million and $0.9 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)

3 Months Ended

Mar. 30, 2014

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
	March 30, 2014			March 31, 2013
Calculation of undistributed (loss) for basic and diluted shares:
Net (loss) income attributable to Potbelly Corporation	$	(301	)	$	18
Less: Accretion of redeemable convertible preferred stock to maximum redemption value		—			(7,396	)

Undistributed (loss) for basic and diluted shares		(301	)	$	(7,378	)

Allocation of undistributed (loss) to participating securities:
Common shares	$	(301	)	$	(7,378	)
Redeemable convertible preferred shares		—			—

Undistributed (loss)	$	(301	)	$	(7,378	)

Weighted average common shares outstanding-basic		29,150,824			4,238,624
Plus: Effect of potential stock options exercise		—			—
Plus: Effect of potential warrant exercise		—			—

Weighted average common shares outstanding-diluted		29,150,824			4,238,624

(Loss) per share available to common stockholders-basic	$	(0.01	)	$	(1.74	)
(Loss) per share available to common stockholders-diluted	$	(0.01	)	$	(1.74	)
Potentially dilutive shares that are considered anti-dilutive:
Common share options		5,238,508			4,418,825
Warrants		241,704			241,704

Stock Options (Tables)

3 Months Ended

Mar. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Under Plans and Agreement

A summary of activity for the thirteen weeks ended March 30, 2014 is as follows:


Options	Shares (Thousands)			Weighted Average Exercise Price		Aggregate Intrinsic Value (Thousands)		Weighted Average Remaining Term (Years)
Outstanding—December 29, 2013		5,030		$	9.41	$	78,575		6.31

Granted		248			20.53
Exercised		(3	)		8.38
Canceled		(36	)		12.67

Outstanding—March 30, 2014		5,239			9.91	$	41,564		6.23

Exercisable—March 30, 2014		3,921			13.24	$	38,203		8.32

Organization and Other Matters - Additional Information (Detail)	3 Months Ended
	Mar. 30, 2014 State Store
Nature Of Business And Basis Of Presentation [Line Items]
Number of sandwich works and shops operation states \| State	21
Domestic Operations [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops	12
International Operations [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops	13
Company Operated Shops [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops	305
Number of closed stores	0
New Shops [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Number of shops	9

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Fair Value Disclosures [Abstract]
Impairment charges	$ 848	$ 26

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 ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Calculation of undistributed (loss) for basic and diluted shares:
Net (loss) income attributable to Potbelly Corporation	$ (301)	$ 18
Less: Accretion of redeemable convertible preferred stock to maximum redemption value		(7,396)
Undistributed (loss) for basic and diluted shares	(301)	(7,378)
Allocation of undistributed (loss) to participating securities:
Undistributed (loss)	$ (301)	$ (7,378)
Weighted average common shares outstanding-basic	29,150,824	4,238,624
Plus: Effect of potential stock options exercise
Plus: Effect of potential warrant exercise
Weighted average common shares outstanding-diluted	29,150,824	4,238,624
(Loss) per share available to common stockholders-basic	$ (0.01)	$ (1.74)
(Loss) per share available to common stockholders-diluted	$ (0.01)	$ (1.74)
Common Share Options [Member]
Allocation of undistributed (loss) to participating securities:
Potentially dilutive shares that are considered anti-dilutive	5,238,508	4,418,825
Common Stock [Member]
Allocation of undistributed (loss) to participating securities:
Undistributed (loss)	$ (301)	$ (7,378)
Warrants [Member]
Allocation of undistributed (loss) to participating securities:
Potentially dilutive shares that are considered anti-dilutive	241,704	241,704
Redeemable Convertible Preferred Stock [Member]
Allocation of undistributed (loss) to participating securities:
Undistributed (loss)

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (191)	$ 16
Pre-tax income (loss)	$ (483)	$ 38
Effective tax rate	39.50%	42.10%

Capital Stock - Additional Information (Detail)	3 Months Ended
Capital Stock - Additional Information (Detail)	Mar. 30, 2014
Equity [Abstract]
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.
Non-voting Common stock conversion basis ratio	1.00

Stock Options - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 06, 2014	Mar. 30, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued		248,000
Recognized stock compensation expense		$ 488	$ 708
Unrecognized stock compensation expense		$ 7,100	$ 900
Unrecognized stock compensation expense, recognition period		Through 2018
2013 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued	247,767
Common stock fair value	$ 20.53
Expected life of options	7 years
Volatility	49.61%
Risk-free interest rate	1.13%
Dividend yield	0.00%
Method used to determine fair value of the options		Black-Scholes option pricing model

Stock Options - Summary of Activity Under Plans and Agreement (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 30, 2014	Dec. 29, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding shares, beginning balance		5,030
Options Outstanding shares, Granted	248
Options Outstanding shares, Exercised	(3)
Options Outstanding shares, Canceled	(36)
Options Outstanding shares, ending balance	5,239
Options Outstanding shares, Exercisable	3,921
Options outstanding weighted average exercise price, Granted	$ 20.53
Options outstanding weighted average exercise price, Exercised	8.38
Options outstanding weighted average exercise price, Canceled	12.67
Options outstanding weighted average exercise price, ending balance	9.91	$ 9.41
Options outstanding weighted average exercise price, exercisable	$ 13.24
Options Outstanding Aggregate Intrinsic value	$ 41,564	$ 78,575
Options Exercisable Aggregate Intrinsic Value	$ 38,203
Option Outstanding Weighted Average Remaining Term	6 years 2 months 23 days	6 years 3 months 22 days
Options Exercisable Weighted Average Remaining Term	8 years 3 months 26 days