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STOCKHOLDERS' EQUITY: - Performance Stock Option Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Restricted stock units      
Share-based compensation      
Share-based compensation expense $ 67,000 $ 29,100 $ 24,700
Restricted stock units | Performance Stock      
Share-based compensation      
Granted (in shares) 534,438 389,065  
Aggregate fair value of restricted stock units granted $ 22,000 $ 10,100  
Forfeited or cancelled (in shares) 133,017    
Restricted stock units | Vesting on first anniversary on closing date      
Share-based compensation      
Granted (in shares)   184,931 212,083
Aggregate fair value of restricted stock units granted   $ 5,100 $ 5,300
Restricted stock units | Vesting on first anniversary on closing date | Minimum      
Share-based compensation      
Performance share awards vested (as a percent)   0.00% 0.00%
Restricted stock units | Vesting on first anniversary on closing date | Maximum      
Share-based compensation      
Performance share awards vested (as a percent)   200.00% 200.00%
Performance stock      
Share-based compensation      
Share-based compensation expense $ 0 $ 500 $ 1,400
Number of shares      
Outstanding at beginning of the period (in shares) 328,806    
Forfeited or cancelled (in shares) (198,652)    
Outstanding at end of the period (in shares) 130,154 328,806  
Exercisable at the end of the period (in shares) 0    
Weighted-average exercise price per share      
Outstanding at the beginning of the period (in dollars per share) $ 21.38    
Forfeited or cancelled (in dollars per share) 21.40    
Outstanding at the end of the period (in dollars per share) 21.44 $ 21.38  
Exercisable at the end of the period (in dollars per share) $ 0    
Weighted-average remaining contractual term      
Outstanding at the end of the period 1 year 1 month 6 days  
Aggregate intrinsic value      
Outstanding at the end of the period $ 4,340    
Exercisable at the end of the period $ 0    
Performance stock | Vesting based on relevant performance period at March 31 2017      
Share-based compensation      
Vesting percentage 0.00%    
Number of units reached maturity 130,154