Document and Entity Information - shares
6 Months Ended
Jul. 01, 2018
Jul. 31, 2018
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 01, 2018  
Entity Registrant Name Bloomin' Brands, Inc.  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   92,538,341
Entity Central Index Key 0001546417  
Current Fiscal Year End Date --12-30  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2