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Document and Entity Information Document - USD ($)
 12 Months Ended
Dec. 26, 2018
Feb. 13, 2019
Jun. 27, 2018
Document Information [Line Items]      
Document type 10-K    
Amendment flag false    
Document period end date Dec. 26, 2018    
Document fiscal year focus 2018    
Document fiscal period focus Q4    
Entity registrant name Shake Shack Inc.    
Entity central index key 0001620533    
Current fiscal year end date --12-26    
Entity filer category Large Accelerated Filer    
Entity current reporting status Yes    
Entity Public Float     $ 1,746,799,325
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business false    
Class A Common Stock      
Document Information [Line Items]      
Entity common stock, shares outstanding (in shares)   29,537,426  
Class B Common Stock      
Document Information [Line Items]      
Entity common stock, shares outstanding (in shares)   7,547,347