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Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 84,803us-gaap_Revenues	$ 84,675us-gaap_Revenues	$ 83,620us-gaap_Revenues	$ 73,881us-gaap_Revenues	$ 74,761us-gaap_Revenues	$ 78,021us-gaap_Revenues	$ 78,186us-gaap_Revenues	$ 68,744us-gaap_Revenues	$ 326,979us-gaap_Revenues	$ 299,712us-gaap_Revenues	$ 274,914us-gaap_Revenues
(Loss) income from operations	1,004us-gaap_OperatingIncomeLoss	3,254us-gaap_OperatingIncomeLoss	3,454us-gaap_OperatingIncomeLoss	(441)us-gaap_OperatingIncomeLoss	(6,614)us-gaap_OperatingIncomeLoss	3,176us-gaap_OperatingIncomeLoss	4,761us-gaap_OperatingIncomeLoss	152us-gaap_OperatingIncomeLoss	7,271us-gaap_OperatingIncomeLoss	1,475us-gaap_OperatingIncomeLoss	8,565us-gaap_OperatingIncomeLoss
Net (loss) income attributable to Potbelly Corporation	$ 702us-gaap_NetIncomeLoss	$ 1,947us-gaap_NetIncomeLoss	$ 2,010us-gaap_NetIncomeLoss	$ (301)us-gaap_NetIncomeLoss	$ (3,684)us-gaap_NetIncomeLoss	$ 2,165us-gaap_NetIncomeLoss	$ 2,759us-gaap_NetIncomeLoss	$ 18us-gaap_NetIncomeLoss	$ 4,358us-gaap_NetIncomeLoss	$ 1,258us-gaap_NetIncomeLoss	$ 24,046us-gaap_NetIncomeLoss
(Loss) income per share available to common stockholders-basic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (1.93)us-gaap_EarningsPerShareBasic	$ (12.29)us-gaap_EarningsPerShareBasic	$ (1.77)us-gaap_EarningsPerShareBasic	$ (1.74)us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ (6.29)us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic
(Loss) income per share available to common stockholders-diluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (1.93)us-gaap_EarningsPerShareDiluted	$ (12.29)us-gaap_EarningsPerShareDiluted	$ (1.77)us-gaap_EarningsPerShareDiluted	$ (1.74)us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted	$ (6.29)us-gaap_EarningsPerShareDiluted	$ 0.66us-gaap_EarningsPerShareDiluted

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