Document and Entity Information - shares
3 Months Ended
Apr. 29, 2017
May 15, 2017
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Apr. 29, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q1  
Trading Symbol DXLG  
Entity Registrant Name DESTINATION XL GROUP, INC.  
Entity Central Index Key 0000813298  
Current Fiscal Year End Date --02-03  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   49,543,425