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Organization and Other Matters - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 17, 2020 USD ($) | Dec. 27, 2020 USD ($) Shop | Dec. 29, 2019 USD ($) | Dec. 30, 2018 USD ($) | Aug. 10, 2020 USD ($) | Mar. 17, 2020 USD ($) | Dec. 31, 2017 USD ($)
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Number of shops franchisees operate | Shop |  | 46 |  |  |  |  |
Income tax expense (benefit) |  | $ (6,536) | $ 14,190 | $ (2,195) |  |  |
Line of credit facility amount borrowed | $ 10,000 |  |  |  |  |  |
Line of credit facility amount borrowed |  | 55,000 |  |  |  |  |
Cash and cash equivalents |  | 11,126 | $ 18,806 | $ 19,775 |  |  | $ 25,530
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Line of credit facility amount borrowed | $ 14,500 |  |  |  |  |  |
COVID 19 [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Impairment charge |  | 10,300 |  |  |  |  |
Income tax expense (benefit) |  | 6,700 |  |  |  |  |
CARES Act Of 2020 [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Line of credit facility amount borrowed |  | 33,500 |  |  |  |  |
CARES Act Of 2020 [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Line of credit facility amount borrowed |  |  |  |  |  | $ 39,800 |
Cash and cash equivalents |  | $ 44,600 |  |  |  |  |
CARES Act Of 2020 [Member] | Harvest Small Business Finance [Member] | Paycheck Protection Program Loan [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Loan amount |  |  |  |  | $ 10,000 |  |
Minimum [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Number of shops Potbelly Corporation owns or operates | Shop |  | 400 |  |  |  |  |

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