v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 30, 2019
May 03, 2019
Document Documentand Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Trading Symbol DNKN  
Entity Registrant Name DUNKIN' BRANDS GROUP, INC.  
Entity Central Index Key 0001357204  
Current Fiscal Year End Date --12-28  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   82,645,468