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Share Capital, Option Plans and Share-Based Payments - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 7,511,605   7,511,605   7,102,753
Cash used to settle awards $ 0 $ 0 $ 0 $ 0  
Capitalized amount of share-based compensation costs 0 0 0 0  
Cash proceeds from exercise of options granted 6,800,000 1,800,000 11,400,000 14,200,000  
Tax benefit realized from exercise of options $ 600,000 $ 15,000.0 $ 900,000 $ 900,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 7,511,605   7,511,605    
Common shares available for issuance (in shares) 8,573,945   8,573,945    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 24,500,000   $ 24,500,000    
Unvested stock awards compensation cost, weighted average recognition period     2 years 10 months 24 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