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Share Capital, Option Plans and Share-Based Payments - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 7,102,753 7,078,435 8,977,830
Cash used to settle awards $ 0 $ 0  
Capitalized amount of share-based compensation costs 0 0  
Cash proceeds from exercise of options granted 35,600,000 54,400,000 $ 20,800,000
Tax benefit realized from exercise of options $ 2,900,000 $ 1,500,000 $ 2,200,000
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 7,102,753    
Common shares available for issuance (in shares) 9,397,479    
Expiration period of options, minimum term 7 years    
Expiration period of options, maximum term 10 years    
Unrecognized compensation cost relating to unvested stock awards $ 24,100,000    
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