v3.7.0.1
Document and Entity Information - shares
3 Months Ended
Jun. 30, 2017
Jul. 28, 2017
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 Jun. 30, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --03-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   28,763,663