Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Feb. 02, 2019
Mar. 15, 2019
Aug. 03, 2018
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Feb. 02, 2019    
Document Fiscal Year Focus 2018    
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 --02-02    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   49,522,233  
Entity Public Float     $ 71.2