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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 6,931,593   6,931,593   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 $ 11,600,000 $ 30,500,000 25,800,000 50,100,000  
Tax benefit realized from exercise of options $ 1,100,000 $ 600,000 $ 2,000,000.0 $ 900,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 6,931,593   6,931,593    
Common shares available for issuance (in shares) 9,940,918   9,940,918    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 21,500,000   $ 21,500,000    
Unvested stock awards compensation cost, weighted average recognition period     2 years 8 months 12 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