Earnings Per Share - Summary of Loss Per Share Calculation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to Potbelly Corporation	$ 2,488	$ 34,712	$ 2,426	$ 31,945
Weighted average common shares outstanding-basic (in shares)	30,192	29,926	30,041	29,903
Plus: Effect of potentially dilutive stock-based compensation awards	296	425	398	499
Plus: Effect of potential warrant exercise	323	363	346	440
Weighted average common shares outstanding-diluted (in shares)	30,811	30,714	30,785	30,842
Income per share available to common stockholders-basic (in USD per share)	$ 0.08	$ 1.16	$ 0.08	$ 1.07
Income per share available to common stockholders-diluted (in USD per share)	$ 0.08	$ 1.13	$ 0.08	$ 1.04
Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares that are considered anti-dilutive (in shares)	389	457	223	223
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares that are considered anti-dilutive (in shares)	0	0	0	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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