Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Sales | Customer concentration risk | Top five customers      
Concentration Risk [Line Items]      
Percentage of revenue 29.00% 28.00% 31.00%