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SHARE-BASED COMPENSATION: SAR activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Performance Stock Option Unit      
Share-based compensation activity      
Granted (in shares) 254,420    
Weighted-average remaining contractual term      
Period for recognition of unrecognized stock-based compensation expense 4 years    
Stock Appreciation Rights (SARs)      
Share-based compensation activity      
Outstanding at the beginning of the period (in shares) 245,404    
Outstanding at the end of the period (in shares) 245,404   245,404
Weighted-average exercise price per share      
Outstanding at the end of the period (in dollars per share) $ 40.00   $ 40.00
Weighted-average remaining contractual term      
Outstanding at the end of the period (in years) 9 months    
Future share-based compensation expense expected $ 0.1    
Restricted stock units      
Weighted-average remaining contractual term      
Share-based compensation expense 6.2 $ 5.1  
Future share-based compensation expense expected $ 55.3    
Period for recognition of unrecognized stock-based compensation expense 4 years    
Restricted stock units | Performance Stock Option Unit      
Share-based compensation activity      
Outstanding at the beginning of the period (in shares) 516,818    
Granted (in shares) 254,420    
Outstanding at the end of the period (in shares) 762,340   516,818
Share-based compensation, 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    
Outstanding at the end of the period (in dollars per share) $ 20.65   $ 18.62
Weighted-average remaining contractual term      
Outstanding at the end of the period (in years) 1 year 10 months 13 days   1 year 8 months 1 day
Aggregate fair value of restricted stock units granted $ 6.3