| Document and Entity Information | Feb. 04, 2021 | Dec. 31, 2020 |
| Document and Entity Information [Abstract] | ||
| Document Type | 8-K | |
| Entity Registrant Name | DHI Group, Inc. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity Address, Postal Zip Code | 80111 | |
| City Area Code | 212 | |
| Local Phone Number | 448-6605 | |
| Entity Address, Address Line One | 6465 South Greenwood Plaza | |
| Entity Address, City or Town | Centennial | |
| Entity Address, Address Line Two | Suite 400 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share | |
| Trading Symbol | DHX | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | false | |
| Entity File Number | 001-33584 | |
| Entity Tax Identification Number | 20-3179218 | |
| Document Information [Line Items] | ||
| Entity Central Index Key | 0001393883 | |
| Document Type | 8-K | |
| Document Fiscal Year Focus | 2020 | |
| Document Fiscal Period Focus | FY | |
| Amendment Flag | false | |
| Entity Address, Postal Zip Code | 80111 | |
| Entity Address, Address Line One | 6465 South Greenwood Plaza | |
| Entity Address, Address Line Two | Suite 400 | |
| Entity Address, City or Town | Centennial | |
| Entity Address, State or Province | CO | |
| Document Period End Date | Feb. 4, 2021 | |
| Entity Emerging Growth Company | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Pre-commencement Tender Offer | false | |
| Soliciting Material | false | |
| Written Communications | false |
