v2.4.0.6
Document and Entity Information
9 Months Ended
Dec. 31, 2011
Jun. 06, 2012
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 Dec. 31, 2011  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --03-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   22,562,258