Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Mar. 06, 2015
Aug. 02, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2015    
Document Fiscal Year Focus 2014    
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 --01-31    
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   50,698,965  
Entity Public Float     $ 158.7