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STOCK-BASED COMPENSATION - Restricted Stock Units and Performance Stock Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Restricted Stock Units (RSUs)    
Number of Shares    
Beginning balance (in shares) 8,646  
Granted (in shares) 4,119  
Vested and released (in shares) (3,099)  
Cancelled/forfeited (in shares) (1,126)  
Ending balance (in shares) 8,539 8,646
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 19.27  
Granted (in dollars per share) 26.07  
Vested and released (in dollars per share) 18.67  
Cancelled/Forfeited (in dollars per share) 20.13  
Ending balance (in dollars per share) $ 22.66 $ 19.27
Weighted Average Remaining Contractual Term (in years) 1 year 25 days 1 year 10 months 6 days
Outstanding balance, Aggregate Intrinsic Value $ 199,726 $ 280,467
Performance Shares    
Number of Shares    
Beginning balance (in shares) 1,576  
Granted (in shares) 497  
Granted for performance achievement (in shares) 20  
Vested and released (in shares) (206)  
Cancelled/forfeited (in shares) (605)  
Ending balance (in shares) 1,282 1,576
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 27.33  
Granted (in dollars per share) 30.41  
Granted for performance achievement (in dollars per share) 16.12  
Vested and released (in dollars per share) 16.12  
Cancelled/Forfeited (in dollars per share) 22.80  
Ending balance (in dollars per share) $ 33.24 $ 27.33
Weighted Average Remaining Contractual Term (in years) 1 year 3 months 25 days 1 year 2 months 26 days
Outstanding balance, Aggregate Intrinsic Value $ 29,986 $ 51,116