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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2025 | Jun. 30, 2024 | Jun. 29, 2025 | Jun. 30, 2024 | Dec. 29, 2024
Revenue Recognition, Milestone Method [Line Items] |  |  |  |  |
Gift card breakage |  |  | $ 502 | $ 502 |
Gift Card |  |  |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |  |  |
Gift card breakage, percent of sales | 11.00% |  | 11.00% |  |
Gift card breakage | $ 200 | $ 500 | $ 200 | $ 500 |
Gift card liability | 4,450 |  | 4,450 |  | $ 6,875
Portillo’s Perks |  |  |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |  |  |
Gift card liability | $ 100 |  | $ 100 |  |
Minimum | Portillo’s Perks |  |  |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |  |  |
Expiration period |  |  | 14 days |  |
Maximum | Portillo’s Perks |  |  |  |  |
Revenue Recognition, Milestone Method [Line Items] |  |  |  |  |
Expiration period |  |  | 30 days |  |

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