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NON-CONTROLLING INTERESTS - Changes in Ownership Interests in SSE Holdings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 25, 2024
Dec. 27, 2023
Noncontrolling Interest [Line Items]      
Net income attributable to Shake Shack Inc. $ 45,725 $ 10,207 $ 20,264
Other comprehensive income (loss):      
Unrealized holding income (loss) on foreign currency translation adjustment 0 2 (3)
Transfers (to) from non-controlling interests:      
Total effect of changes in ownership interest on equity attributable to Shake Shack Inc. 33,353 8,112 17,255
Unrealized holding income (loss) on foreign currency translation adjustment      
Other comprehensive income (loss):      
Unrealized holding income (loss) on foreign currency translation adjustment 0 2 (3)
Additional Paid-In Capital | Redemption or Exchange of Units      
Transfers (to) from non-controlling interests:      
Increase (decrease) in additional paid-in capital (271) 3,517 265
Additional Paid-In Capital | Employee Stock Option      
Transfers (to) from non-controlling interests:      
Increase (decrease) in additional paid-in capital $ (12,101) $ (5,614) $ (3,271)