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STOCKHOLDERS' EQUITY: - RSU Activity (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Time-vesting      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 3,307,577    
Granted (in shares) 1,794,915 2,309,183 1,427,561
Vested (in shares) (1,236,644)    
Forfeited or cancelled (in shares) (416,847)    
Outstanding at the end of the period (in shares) 3,449,001 3,307,577  
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) $ 22.57    
Granted (in dollars per share) 26.22    
Vested (in dollars per share) 22.58    
Forfeited or cancelled (in dollars per share) 23.54    
Outstanding at the end of the period (in dollars per share) $ 24.35 $ 22.57  
Weighted-average remaining contractual term      
Weighted-average remaining contractual term (in years) 2 years 3 months 25 days 2 years 5 months 12 days  
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 47.1 $ 55.4 $ 27.0
Total fair value of units vested $ 52.1 $ 23.1 $ 17.6
Time-vesting | Arbor and Circulate      
Non-vested restricted stock unit activity      
Granted (in shares)   768,710  
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted   $ 20.0  
Vesting in one year      
Non-vested restricted stock unit activity      
Granted (in shares) 50,691 48,230 72,650
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 1 year 1 year 1 year
Vesting in two years      
Non-vested restricted stock unit activity      
Granted (in shares) 174,368   70,799
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 2 years   2 years
Vesting in three years      
Non-vested restricted stock unit activity      
Granted (in shares) 106,571    
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 3 years    
Vesting in four years      
Non-vested restricted stock unit activity      
Granted (in shares) 1,463,285 1,454,340 1,041,572
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 4 years 4 years 4 years
Vesting In Fifteen Months      
Non-vested restricted stock unit activity      
Granted (in shares)     242,540.0
Restricted Stock Unit Activity - Other disclosures      
Award vesting period     15 months
Partial cliff vest tranche one      
Non-vested restricted stock unit activity      
Granted (in shares)   398,079  
Partial cliff vest tranche two      
Non-vested restricted stock unit activity      
Granted (in shares)   408,534