Document and Entity Information - shares
9 Months Ended
Sep. 24, 2017
Oct. 31, 2017
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 24, 2017  
Entity Registrant Name Bloomin' Brands, Inc.  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   91,269,593
Entity Central Index Key 0001546417  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3