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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, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 7,359,490   7,359,490   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 23,400,000 11,600,000 34,800,000 25,800,000  
Tax benefit realized from exercise of options $ 400,000 $ 1,100,000 $ 1,300,000 $ 2,000,000.0  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 7,359,490   7,359,490    
Common shares available for issuance (in shares) 7,840,000   7,840,000    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 30,300,000   $ 30,300,000    
Unvested stock awards compensation cost, weighted average recognition period     3 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