Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Jan. 28, 2017
Mar. 17, 2017
Jul. 30, 2016
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 28, 2017    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Trading Symbol DXLG    
Entity Registrant Name DESTINATION XL GROUP, INC.    
Entity Central Index Key 0000813298    
Current Fiscal Year End Date --01-28    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   49,988,655  
Entity Public Float     $ 121.6