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Share Capital, Option Plans and Share-Based Payments - Schedule of Share-Based Payments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 6,712 $ 5,080 $ 20,152 $ 20,473
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 2,616 983 7,537 7,014
Performance Share Units | Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 879 751 2,573 2,723
Restricted Stock Units (RSUs) | Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,687 1,588 4,698 4,987
Restricted Stock Units (RSUs) | Other plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 36 146 169 823
Deferred Share Units (directors)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 709 701 2,402 2,193
Employee Share Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 785 $ 911 $ 2,773 $ 2,733