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STOCK-BASED COMPENSATION: - Time-vesting restricted stock unit activity (Details) - Restricted stock units - Time Based Vesting - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Non-vested restricted stock unit activity    
Outstanding at the beginning of the period (in shares) 2,692,243  
Granted (in shares) 1,675,062  
Vested (in shares) (101,285)  
Forfeited or cancelled (in shares) (208,218)  
Outstanding at the end of the period (in shares) 4,057,802 2,692,243
Non-vested restricted stock units, Weighted average fair value per share at grant date    
Outstanding at the beginning of the period (in dollars per share) $ 45.96  
Granted (in dollars per share) 47.01  
Vested (in dollars per share) 39.27  
Forfeited or cancelled (in dollars per share) 46.71  
Outstanding at the end of the period (in dollars per share) $ 46.52 $ 45.96
Weighted average remaining contractual term (in years) 3 years 29 days 2 years 9 months 3 days