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SHAREHOLDERS' EQUITY: Stock-Based Employee Compensation, Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 0.3 $ 2.2 $ 2.1 $ 4.6
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
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]        
Threshold trading days     50 days  
Performance-based restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Performance-based restricted stock units | Tranche 1 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     200.00%