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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Stock Award Rollforward    
Stock awards outstanding at the beginning of the period (in shares) 9,191 7,820
Stock awards granted (in shares) 5,343 5,123
Stock awards vested (in shares) (2,498) (1,945)
Stock awards canceled and forfeited (in shares) (564) (663)
Stock awards outstanding at the end of the period (in shares) 11,472 10,335
Weighted-average fair value of grants during the period (in dollars per share) $ 15.75 $ 22.35
Weighted-average remaining recognition period (in years)  1 year 11 months 15 days 2 years 3 months 10 days
Total unrecognized compensation expense at period-end $ 144,066 $ 127,540
Stock Option Rollforward    
Stock options outstanding at the beginning of the period (in shares) 2,274 3,114
Options granted (in shares) 0 0
Options exercised (in shares) (36) (287)
Options forfeited (in shares) (28) (39)
Options outstanding at the end of the period (in shares) 2,210 2,788
Weighted-average fair value of grants during the period (in dollars per share) $ 0 $ 0
Total intrinsic value of options exercised during the period $ 302 $ 3,726
Weighted-average remaining recognition period (in years)  1 year 6 months 14 days 2 years 3 months 25 days
Total unrecognized compensation expense at period-end $ 671 $ 1,268