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STOCKHOLDERS' EQUITY: - Non-vested performance-based restricted stock unit activity (Details) - Restricted stock units - Performance stock - $ / shares
9 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Non-vested restricted stock unit activity        
Outstanding at the beginning of the period (in shares) 545,446 545,446    
Granted (in shares)   246,524 202,818 534,438
Additional earned performance shares (in shares)   38,063    
Vested (in shares)   (122,573)    
Units vested under the Company's March 2021 acceleration plan (in shares)   (39,344)    
Forfeited or cancelled (in shares)   (36,247)    
Outstanding at the end of the period (in shares)   631,869 545,446  
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) $ 51.01 $ 51.01    
Granted (in dollars per share)   43.40    
Additional earned performance shares (in dollars per share)   55.48    
Vested (in dollars per share)   48.86    
Units vested under the Company's March 2021 acceleration plan (in dollars per share)   49.14    
Forfeited or cancelled (in dollars per share)   35.42    
Outstanding at the end of the period (in dollars per share)   $ 49.74 $ 51.01  
Weighted average remaining contractual term (in years) 2 years 2 months 26 days 1 year 6 months 14 days