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Description of Business	12 Months Ended
Description of Business	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS	DESCRIPTION OF BUSINESS Organization Orion includes Orion Energy Systems, Inc., a Wisconsin corporation, and all consolidated subsidiaries. Orion is a developer, manufacturer and seller of lighting and energy management systems to commercial and industrial businesses, and federal and local governments, predominantly in North America. Orion’s corporate offices and leased primary manufacturing operations are located in Manitowoc, Wisconsin. Orion leases office space in Jacksonville, Florida; Chicago, Illinois; and Houston, Texas. Orion also leases warehouse space in Manitowoc, Wisconsin and Augusta, Georgia.