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Description of Business	12 Months Ended
Description of Business	Mar. 31, 2016
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, predominantly in North America. See Note 10 “Segment Data” of these financial statements for further discussion of Orion's reportable segments. Orion's corporate offices and primary manufacturing operations are located in Manitowoc, Wisconsin. Orion leases office space in Jacksonville, Florida; Chicago, Illinois; and Houston, Texas.