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NATURE OF OPERATIONS (Details) - Restaurant
Dec. 31, 2025
Dec. 25, 2024
Class of Stock [Line Items]    
Number of restaurants 659  
Shake Shack Inc.    
Class of Stock [Line Items]    
Ownership percent of noncontrolling interest 94.30% 94.20%
United States | Company-operated    
Class of Stock [Line Items]    
Number of restaurants 373