| Document and Entity Information | Jan. 18, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001409375 |
| Document Type | 8-K |
| Document Period End Date | Jan. 18, 2022 |
| Entity Registrant Name | ORION ENERGY SYSTEMS, INC. |
| Entity Incorporation State Country Code | WI |
| Entity File Number | 01-33887 |
| Entity Tax Identification Number | 39-1847269 |
| Entity Address, Address Line One | 2210 Woodland Drive |
| Entity Address, City or Town | Manitowoc |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 54220 |
| City Area Code | (920) |
| Local Phone Number | 892-9340 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, no par value |
| Trading Symbol | OESX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
