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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 8,977,830 8,354,816 8,750,730
Unrecognized compensation cost relating to unvested stock awards $ 23,800,000    
Unvested stock awards compensation cost, weighted average recognition period 2 years 5 months 5 days    
Cash used to settle awards $ 0 $ 0 $ 0
Capitalized amount of share-based compensation costs 0 0 0
Cash proceeds from exercise of options granted 20,800,000 14,600,000 12,200,000
Tax benefit realized from exercise of options $ 2,200,000 $ 800,000 $ 1,000,000
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 8,977,830    
Common shares available for issuance (in shares) 11,864,002    
Expire period of options, minimum term 7 years    
Expire period of options, maximum term 10 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