Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2021	Aug. 13, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Trading Symbol	DXLG
Entity Registrant Name	DESTINATION XL GROUP, INC.
Entity Central Index Key	0000813298
Current Fiscal Year End Date	--01-29
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		63,549,426
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
Security Exchange Name	NONE
Entity Incorporation, State or Country Code	DE