Document and Entity Information - shares
9 Months Ended
Nov. 02, 2019
Nov. 15, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Nov. 02, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol DXLG  
Entity Registrant Name DESTINATION XL GROUP, INC.  
Entity Central Index Key 0000813298  
Current Fiscal Year End Date --02-01  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   50,348,577
Entity File Number 01-34219  
Entity Tax Identification Number 04-2623104  
Entity Address, Address Line One 555 Turnpike Street  
Entity Address, City or Town Canton  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02021  
City Area Code 781  
Local Phone Number 828-9300  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, $0.01 par value  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE