XML 13 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
Document and Entity Information Document and Entity Information - shares
 9 Months Ended
Sep. 27, 2017
Oct. 25, 2017
Document Information [Line Items]    
Document type 10-Q  
Amendment flag false  
Document period end date Sep. 27, 2017  
Document fiscal year focus 2017  
Document fiscal period focus Q3  
Entity registrant name SHAKE SHACK INC.  
Entity central index key 0001620533  
Current fiscal year end date --12-27  
Entity filer category Accelerated Filer  
Entity current reporting status Yes  
Class A Common Stock    
Document Information [Line Items]    
Entity common stock, shares outstanding (in shares)   26,195,741
Class B Common Stock    
Document Information [Line Items]    
Entity common stock, shares outstanding (in shares)   10,534,792