Quarterly report pursuant to Section 13 or 15(d)

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Narrative (Details)

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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Narrative (Details) - $ / shares
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair values of RSUs granted (usd per share) $ 7.53 $ 3.36 $ 7.55 $ 3.44