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STOCK-BASED COMPENSATION: Non vested time vesting restricted stock unit activity (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Restricted Stock Unit Activity - Other disclosures      
Share-based compensation expense $ 25.4 $ 17.5  
Future share-based compensation expense expected $ 137.3    
Performance stock      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 394,188    
Granted (in shares) 202,818    
Forfeited or cancelled (in shares) (46,236)    
Outstanding at the end of the period (in shares) 550,770   394,188
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) $ 43.88    
Granted (in dollars per share) 60.65    
Forfeited or cancelled (in dollars per share) 34.61    
Outstanding at the end of the period (in dollars per share) $ 50.83   $ 43.88
Weighted-average remaining contractual term      
Weighted average remaining contractual term (in years) 2 years 8 months 23 days   3 years 2 months 23 days
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 12.3    
Time Based Vesting      
Non-vested restricted stock unit activity      
Outstanding at the beginning of the period (in shares) 3,054,750    
Granted (in shares) 1,273,119    
Vested (in shares) (237,220)    
Forfeited or cancelled (in shares) (220,733)    
Outstanding at the end of the period (in shares) 3,869,916   3,054,750
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) $ 30.91    
Granted (in dollars per share) 53.06    
Vested (in dollars per share) 24.61    
Forfeited or cancelled (in dollars per share) 36.19    
Outstanding at the end of the period (in dollars per share) $ 38.28   $ 30.91
Weighted-average remaining contractual term      
Weighted average remaining contractual term (in years) 2 years 6 months 18 days   2 years 5 months 19 days
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 67.5    
Total fair value $ 12.0    
Time Based Vesting | Data Plus Math Corporation      
Non-vested restricted stock unit activity      
Granted (in shares) 155,346    
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 7.3    
Performance Shares Vesting Total Shareholder Return      
Non-vested restricted stock unit activity      
Granted (in shares) 60,844    
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 4.4    
Performance Shares Vesting Under The Second Plan      
Non-vested restricted stock unit activity      
Granted (in shares) 141,974    
Restricted Stock Unit Activity - Other disclosures      
Aggregate fair value of restricted stock units granted $ 7.9    
Vesting in four years      
Restricted Stock Unit Activity - Other disclosures      
Vesting period 4 years    
Minimum | Performance Shares Vesting Total Shareholder Return      
Restricted Stock Unit Activity - Other disclosures      
Vesting percentage 0.00%    
Minimum | Performance Shares Vesting Under The Second Plan      
Restricted Stock Unit Activity - Other disclosures      
Vesting percentage 0.00%    
Maximum | Performance Shares Vesting Total Shareholder Return      
Restricted Stock Unit Activity - Other disclosures      
Vesting percentage 200.00%    
Maximum | Performance Shares Vesting Under The Second Plan      
Restricted Stock Unit Activity - Other disclosures      
Vesting percentage 200.00%