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Share Capital, Option Plans and Share-Based Payments - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 7,179,373   7,078,435
Cash used to settle awards $ 0 $ 0  
Capitalized amount of share-based compensation costs 0 0  
Cash proceeds from exercise of options granted 12,400,000 16,200,000  
Tax benefit realized from exercise of options $ 900,000 $ 100,000  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 7,179,373    
Common shares available for issuance (in shares) 10,298,756    
Expiration period of options, minimum term 7 years    
Expiration period of options, maximum term 10 years    
Unrecognized compensation cost relating to unvested stock awards $ 21,800,000    
Unvested stock awards compensation cost, weighted average recognition period 2 years 9 months 18 days    
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