Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Schedule of Assumptions Used to Valuing Stock Purchase Plan (Details)

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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Schedule of Assumptions Used to Valuing Stock Purchase Plan (Details) - Stock purchase plan - $ / shares
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option life (in years) 6 months 6 months 6 months
Risk-free interest rate 0.55% 0.26% 0.07%
Stock price volatility 64.18% 77.94% 36.58%
Weighted-average grant date fair value (usd per share) $ 2.11 $ 2.32 $ 2.88