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Share Capital, Option Plans and Share-Based Payments - Summary of Stock Options Outstanding Under Various Stock Option Plans (Details) - $ / shares
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options grated to date (in shares) 1,870,340 1,322,340  
Options exercised to date (in shares) (1,472,031) (2,869,569)  
Options outstanding (in shares) 7,102,753 7,078,435 8,977,830
2004 Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options grated to date (in shares) 32,398,418    
Options exercised to date (in shares) (17,663,048)    
Options cancelled to date (in shares) (7,632,617)    
Options outstanding (in shares) 7,102,753    
Vesting schedule 25.00%    
Minimum (in dollars per share) $ 13.19    
Maximum (in dollars per share) $ 40.20    
2004 Stock Option Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Termination grace periods 90 days    
2004 Stock Option Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Termination grace periods 180 days