Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2021	May 14, 2021	Jul. 31, 2020
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	We are filing this Amendment No. 1 to our Annual Report on Form 10−K for the fiscal year ended January 30, 2021 (this “Form 10-K/A”) pursuant to General Instruction G(3) to Form 10−K for the purposes of filing the information required to be disclosed pursuant to Part III of Form 10−K.   Except for the amendments described above, this Form 10−K/A does not modify or update the disclosure in our Annual Report on Form 10−K for the fiscal year ended January 30, 2021 filed with the Securities and Exchange Commission on March 19, 2021.
Document Period End Date	Jan. 30, 2021
Document Fiscal Year Focus	2020
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	--01-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		63,526,601
Entity Public Float			$ 12.2
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 Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Title of 12(g) Security	Common Stock, $0.01 par value
Entity Incorporation, State or Country Code	DE
ICFR Auditor Attestation Flag	false
Documents Incorporated by Reference	None.