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SHAREHOLDERS' EQUITY: Stock-Based Employee Compensation, Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
day
shares
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation | $ $ 2.5 $ 1.9 $ 7.1 $ 6.5
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Stock granted (in shares) 0   338,859  
Restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Restricted stock units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     5 years  
Restricted stock units | Tranche 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Restricted stock units | Tranche 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Restricted stock units | Tranche 3        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Threshold trading days | day     50  
Additional service period     2 years  
Stock granted (in shares) 0   733,688  
Performance-based restricted stock units | Tranche 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock granted (in shares)     52,590  
Performance-based restricted stock units | Tranche 1 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     200.00%  
Performance-based restricted stock units | Tranche 2 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     100.00%