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Share Capital, Option Plans and Share-Based Payments - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,964,408   8,964,408   8,354,816
Unrecognized compensation cost relating to unvested stock awards $ 22,300,000   $ 22,300,000    
Unvested stock awards compensation cost, weighted average recognition period     2 years 2 months 8 days    
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards 0 $ 0 $ 0 $ 0  
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 0 0 0 0  
Cash proceeds from exercise of options granted 12,200,000 2,000,000 16,700,000 8,300,000  
Tax benefit realized from exercise of options $ 1,500,000 $ 400,000 $ 1,900,000 $ 600,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,964,408   8,964,408    
Common shares available for issuance (in shares) 12,057,100   12,057,100    
Expire period of options, minimum term     7 years    
Expire period of options, maximum term     10 years    
Stock Options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years    
Stock Options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     5 years