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Share Capital, Option Plans and Share-Based Payments - Schedule of Share-Based Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 30,507 $ 25,978 $ 22,047
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 12,196 13,202 12,193
Deferred Stock Units (Directors)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,849 2,764 2,038
Long Term Incentive Plan | Performance Stock Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 3,624 2,688 2,287
Long Term Incentive Plan | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 6,452 5,086 4,574
Other plans | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,804 1,573 955
Employee Share Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 2,582 $ 665 $ 0