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SEGMENT REPORTING - Schedule of Segment Reporting (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 25, 2024
Dec. 27, 2023
Segment Reporting Information [Line Items]      
Total revenue $ 1,445,306 $ 1,252,608 $ 1,087,533
Less:      
Food and paper costs 396,714 339,940 305,041
Labor and related expenses 360,693 338,750 304,254
Other operating expenses 212,677 178,381 149,449
Occupancy and related expenses 106,632 93,069 79,846
General and administrative expenses 176,233 149,047 129,542
Depreciation and amortization expense 106,600 102,468 91,242
Pre-opening costs 18,001 15,547 19,231
Impairments, loss on disposal of assets, and Shack closures 5,248 32,368 3,007
Interest expense 2,159 2,045 1,717
Income tax expense (benefit) 22,903 3,424 (4,010)
Other income, net 12,260 13,251 12,776
NET INCOME 49,706 10,820 20,990
TOTAL ASSETS 1,896,209 1,696,971  
Interest income 165 761 2,443
Reportable Segment      
Less:      
TOTAL ASSETS 1,896,209 1,696,971  
Reportable Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Total revenue 1,445,306 1,252,608 1,087,533
Less:      
Food and paper costs 396,714 339,940 305,041
Labor and related expenses 360,693 338,750 304,254
Other operating expenses 212,677 178,381 149,449
Occupancy and related expenses 106,632 93,069 79,846
General and administrative expenses 176,233 149,047 129,542
Depreciation and amortization expense 106,600 102,468 91,242
Pre-opening costs 18,001 15,547 19,231
Impairments, loss on disposal of assets, and Shack closures 5,248 32,368 3,007
Interest expense 2,159 2,045 1,717
Income tax expense (benefit) 22,903 3,424 (4,010)
Other income, net (12,260) (13,251) (12,776)
NET INCOME 49,706 10,820 20,990
Reportable Segment | Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment      
Less:      
NET INCOME $ 0 $ 0 $ 0