Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE PLANS AND STOCK-BASED COMPENSATION - Assumptions used to calculate fair values of market PSU's (Details)

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STOCK INCENTIVE PLANS AND STOCK-BASED COMPENSATION - Assumptions used to calculate fair values of market PSU's (Details) - Performance share units - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Discount period (years) 1 year 11 months 12 days 7 years
Risk-free interest rate 2.63% 2.48%
Stock price volatility 69.35% 75.52%
Grant date fair value $ 1.70 $ 4.29