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SHARE-BASED COMPENSATION: (Details 4) - Restricted stock units - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Restricted Stock Unit Activity - Other disclosures      
Share-based compensation expense $ 5.1 $ 3.2  
Future share-based compensation expense expected $ 43.3    
Period for recognition of unrecognized stock-based compensation expense 4 years    
Time-vesting      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 2,052,865    
Granted (in shares) 634,145    
Vested (in shares) (310,781)    
Forfeited or cancelled (in shares) (65,787)    
Outstanding at the end of the period (in shares) 2,310,442   2,052,865
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) $ 20.53    
Granted (in dollars per share) 17.58    
Vested (in dollars per share) 18.02    
Forfeited or cancelled (in dollars per share) 19.91    
Outstanding at the end of the period (in dollars per share) $ 20.07   $ 20.53
Weighted-average remaining contractual term      
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 2 years 3 months 7 days   1 year 11 months 12 days
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 11.1    
Vesting in four years      
Non-vested restricted stock unit activity      
Granted (in shares) 614,892    
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 4 years    
Vesting in one year      
Non-vested restricted stock unit activity      
Granted (in shares) 19,253    
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 1 year    
Performance-based      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 389,310    
Granted (in shares) 327,187    
Forfeited or cancelled (in shares) (41,814)    
Outstanding at the end of the period (in shares) 674,683   389,310
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) $ 21.12    
Granted (in dollars per share) 18.12    
Forfeited or cancelled (in dollars per share) 20.97    
Outstanding at the end of the period (in dollars per share) $ 19.67   $ 21.12
Weighted-average remaining contractual term      
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms 2 years 7 days   1 year 6 months 26 days
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 5.9    
Vesting based on total shareholder return | Minimum      
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 0.00%    
Vesting based on total shareholder return | Maximum      
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 200.00%