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Organization and Other Matters - Additional Information (Detail)	3 Months Ended
	Mar. 30, 2025 subsidiary joint_venture shop
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of shops Potbelly Corporation owns or operates	341
Number of shops franchisees operate	103
Number of wholly owned subsidiaries | subsidiary	7
Number of joint ventures | joint_venture	6
Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest rate	51.00%
Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership interest rate	80.00%

X

- Definition

Joint venture ownership percentage.

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- Definition

Number of joint ventures.

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- Definition

Number of shops operate by franchisees.

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- Definition

Number of shops owns or operates by entity.

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- Definition

Number of wholly owned subsidiaries.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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