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Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2022
May 31, 2022
Sep. 30, 2021
Cover [Abstract]      
Entity Registrant Name Orion Energy Systems, Inc.    
Entity Central Index Key 0001409375    
Document Type 10-K    
Document Period End Date Mar. 31, 2022    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --03-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Public Float     $ 103,616,098
Entity Common Stock, Shares Outstanding   31,098,938  
Entity File Number 001-33887    
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    
Entity Interactive Data Current Yes    
Entity Incorporation, State or Country Code WI    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Common stock, no par value    
Trading Symbol OESX    
Security Exchange Name NASDAQ    
Auditor Name BDO USA, LLP    
Auditor Location Milwaukee, WI    
Auditor Firm ID 243    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant's Proxy Statement for the 2022 Annual Meeting of Shareholders to be held on August 4, 2022 are incorporated herein by reference in Part III of this Annual Report on Form 10-K.