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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock Option Rollforward    
Stock options outstanding at the beginning of the period (in shares) 3,114 3,998
Options granted (in shares) 0 222
Options exercised (in shares) (391) (641)
Options canceled and forfeited (in shares) (55) (192)
Options outstanding at the end of the period (in shares) 2,668 3,387
Weighted-average fair value of grants during the period (in dollars per share) $ 0 $ 8.27
Total intrinsic value of options exercised during the period $ 4,844 $ 9,148
Weighted-average remaining recognition period at period-end (in years) 2 years 1 month 28 days 2 years 6 months 10 days
Stock Award Rollforward    
Stock awards outstanding at the beginning of the period (in shares) 7,820 5,939
Stock awards granted (in shares) 5,886 4,993
Stock awards vested (in shares) (2,860) (2,123)
Stock awards canceled and forfeited (in shares) (1,056) (700)
Stock awards outstanding at the end of the period (in shares) 9,790 8,109
Weighted-average fair value of grants during the period (in dollars per share) $ 22.35 $ 20.05
Weighted-average remaining recognition period at period-end (in years) 2 years 1 month 17 days 2 years 4 months 24 days
Total unrecognized compensation expense at period-end $ 143,593 $ 112,970