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SHARE-BASED COMPENSATION: SAR activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Stock Appreciation Rights (SARs)      
Share-based compensation activity      
Outstanding at the beginning of the period (in shares)   245,404  
Forfeited or cancelled (in shares)   (245,404)  
Outstanding at the end of the period (in shares) 0 0 245,404
Weighted-average exercise price per share      
Outstanding at the beginning of the period (in dollars per share)   $ 40.00  
Weighted-average exercise price per share, Forfeited or canceled (in dollars per share)   40.00  
Outstanding at the end of the period (in dollars per share) $ 0.00 $ 0.00 $ 40.00
Weighted-average remaining contractual term      
Weighted average remaining contractual term (in years) 0 years    
Aggregate intrinsic value      
Vesting percentage   100.00%  
Restricted stock units | Time Based Vesting      
Share-based compensation activity      
Outstanding at the beginning of the period (in shares)   3,307,577  
Forfeited or cancelled (in shares)   (345,581)  
Outstanding at the end of the period (in shares) 3,582,042 3,582,042 3,307,577
Weighted-average remaining contractual term      
Weighted average remaining contractual term (in years)   2 years 5 months 23 days 2 years 5 months 12 days
Aggregate intrinsic value      
Aggregate fair value of restricted stock units granted   $ 44.2  
Granted (in shares)   1,687,416  
Restricted stock units | Partial cliff vest tranche one      
Aggregate intrinsic value      
Vesting percentage   25.00%  
Granted (in shares)   1,008,851  
Restricted stock units | Partial cliff vesting tranche two      
Aggregate intrinsic value      
Vesting percentage   75.00%  
Vesting period (in years)   3 years  
Restricted stock units | Time based vesting in one year anniversary      
Aggregate intrinsic value      
Vesting percentage   50.00%  
Granted (in shares)   174,368  
Vesting period (in years)   1 year  
Restricted stock units | Vesting in four years      
Aggregate intrinsic value      
Granted (in shares)   358,812  
Vesting period (in years)   4 years  
Restricted stock units | Time based vesting over three years      
Aggregate intrinsic value      
Granted (in shares)   106,571  
Vesting period (in years)   3 years  
Restricted stock units | Vesting in one year      
Aggregate intrinsic value      
Vesting percentage   50.00%  
Granted (in shares)   38,814  
Vesting period (in years)   1 year