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SHARE-BASED COMPENSATION: Non vested time vesting restricted stock unit activity (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Restricted Stock Unit Activity - Other disclosures      
Share awards vesting percentage (as a percent) 25.00%    
Stock Appreciation Right      
Non-vested restricted stock unit activity      
Granted (in shares) 254,419    
Restricted Stock Unit Activity - Other disclosures      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 254,419    
Period for recognition of unrecognized stock-based compensation expense 5 years    
Restricted stock units      
Restricted Stock Unit Activity - Other disclosures      
Share-based compensation expense $ 15.4 $ 8.5  
Future share-based compensation expense expected $ 59.1    
Period for recognition of unrecognized stock-based compensation expense 4 years    
Restricted stock units | Time-vesting      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 2,279,895    
Granted (in shares) 1,257,215    
Vested (in shares) (772,762)    
Forfeited or cancelled (in shares) (95,560)    
Outstanding at the end of the period (in shares) 2,668,788   2,279,895
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) $ 19.69    
Granted (in dollars per share) 21.74    
Vested (in dollars per share) 20.28    
Forfeited or cancelled (in dollars per share) 19.38    
Outstanding at the end of the period (in dollars per share) $ 20.50   $ 19.69
Weighted-average remaining contractual term      
Outstanding at the end of the period (in years) 2 years 7 months 21 days   2 years 1 month 13 days
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 27.3    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,257,215    
Restricted stock units | Vesting in four years      
Non-vested restricted stock unit activity      
Granted (in shares) 1,045,041    
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,045,041    
Restricted stock units | Vesting in one year      
Non-vested restricted stock unit activity      
Granted (in shares) 24,160    
Restricted Stock Unit Activity - Other disclosures      
Award vesting period 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 24,160    
Restricted stock units | Tranche one      
Non-vested restricted stock unit activity      
Granted (in shares) 188,014    
Restricted Stock Unit Activity - Other disclosures      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 188,014    
Restricted stock units | Stock Appreciation Right      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 516,818    
Granted (in shares) 254,419    
Forfeited or cancelled (in shares) (26,142)    
Outstanding at the end of the period (in shares) 745,095   516,818
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) $ 18.62    
Granted (in dollars per share) 24.66    
Forfeited or cancelled (in dollars per share) 17.57    
Outstanding at the end of the period (in dollars per share) $ 20.72   $ 18.62
Weighted-average remaining contractual term      
Outstanding at the end of the period (in years) 1 year 7 months 17 days   1 year 8 months 1 day
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 6.3    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 254,419    
Restricted stock units | Vesting based on total shareholder return | Minimum      
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 0.00%    
Restricted stock units | Vesting based on total shareholder return | Maximum      
Restricted Stock Unit Activity - Other disclosures      
Performance share awards vested (as a percent) 200.00%