Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Fair Value Assumptions PSUs (Details)

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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Fair Value Assumptions PSUs (Details) - Performance share units - $ / shares
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Discount period (years) 3 years 1 year 11 months 12 days 7 years
Risk-free interest rate 1.45% 2.63% 2.48%
Stock price volatility 72.00% 69.35% 75.52%
Grant date fair value (in dollars per share) $ 5.92 $ 1.70 $ 4.29