v2.4.0.6
Document and Entity Information
6 Months Ended
Sep. 30, 2011
Nov. 04, 2011
Document and Entity Information [Abstract]    
Entity Registrant Name ORION ENERGY SYSTEMS, INC.  
Entity Central Index Key 0001409375  
Document Type 10-Q  
Document Period End Date Sep. 30, 2011  
Amendment Flag true  
Amendment Description In this Quarterly Report on Form 10-Q/A, we have restated our previously issued unaudited consolidated financial statements and related disclosures for the quarter ended September 30, 2011.  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --03-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   23,010,653