| Document and Entity Information | Dec. 09, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001738827 |
| Document Type | 8-K |
| Document Period End Date | Dec. 9, 2021 |
| Entity Registrant Name | KLX ENERGY SERVICES HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38609 |
| Entity Tax Identification Number | 36-4904146 |
| Entity Address, Address Line One | 3040 Post Oak Boulevard, 15th Floor |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77056 |
| City Area Code | (832) |
| Local Phone Number | 844-1015 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, $0.001 par value |
| Trading Symbol | KLXE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
