STOCK-BASED COMPENSATION - Restricted Stock Units and Performance Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021
Restricted Stock Units (RSUs)
Number of Shares
Beginning balance (in shares)	8,646
Granted (in shares)	3,466
Vested and released (in shares)	(969)
Forfeited (in shares)	(317)
Ending balance (in shares)	10,826	8,646
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 19.27
Granted (in dollars per share)	26.36
Vested and released (in dollars per share)	20.07
Forfeited (in dollars per share)	19.71
Ending balance (in dollars per share)	$ 21.45	$ 19.27
Weighted Average Remaining Contractual Term (in years)	2 years 18 days	1 year 10 months 6 days
Outstanding balance, Aggregate Intrinsic Value	$ 300,524	$ 280,467
Unamortized stock-based compensation expense	$ 165,100
Performance Shares
Number of Shares
Beginning balance (in shares)	1,576
Granted (in shares)	465
Granted for performance achievement (in shares)	20
Vested and released (in shares)	(206)
Forfeited (in shares)	(198)
Ending balance (in shares)	1,657	1,576
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 27.33
Granted (in dollars per share)	27.92
Granted for performance achievement (in dollars per share)	27.92
Vested and released (in dollars per share)	16.12
Forfeited (in dollars per share)	24.61
Ending balance (in dollars per share)	$ 30.56	$ 27.33
Weighted Average Remaining Contractual Term (in years)	1 year 5 months 4 days	1 year 2 months 26 days
Outstanding balance, Aggregate Intrinsic Value	$ 46,012	$ 51,116
Unamortized stock-based compensation expense	$ 32,300