| Document and Entity Information | Dec. 11, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 11, 2020 |
| Entity Registrant Name | DESTINATION XL GROUP, INC. |
| Entity Central Index Key | 0000813298 |
| Entity Emerging Growth Company | false |
| Entity File Number | 01-34219 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | DXLG |
| Security Exchange Name | NASDAQ |
