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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 7,078,435 8,977,830 8,354,816
Cash used to settle awards $ 0 $ 0  
Capitalized amount of share-based compensation costs 0 0  
Cash proceeds from exercise of options granted 54,400,000 20,800,000 $ 14,600,000
Tax benefit realized from exercise of options $ 1,500,000 $ 2,200,000 $ 800,000
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 7,078,435    
Common shares available for issuance (in shares) 10,893,828    
Expiration period of options, minimum term 7 years    
Expiration period of options, maximum term 10 years    
Unrecognized compensation cost relating to unvested stock awards $ 19,000,000    
Unvested stock awards compensation cost, weighted average recognition period 2 years 6 months 11 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