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Share Capital, Option Plans and Share-Based Payments - Schedule of Share-Based Payments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 7,158 $ 7,572 $ 15,393 $ 15,712
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 2,729 2,787 6,031 6,675
Deferred Stock Units (Directors)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 945 830 1,492 1,341
Employee Share Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 836 500 1,822 1,006
Long Term Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,513 1,765 3,399 3,367
Long Term Incentive Plan | Performance Stock Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 937 947 1,972 1,828
Other plans | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 198 $ 743 $ 677 $ 1,495