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Share Capital, Option Plans and Share-Based Payments - Summary of Outstanding Stock Options, Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,452,430   8,452,430   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 $ 3,400,000 $ 2,100,000 19,600,000 4,500,000  
Tax benefit realized from exercise of options $ 200,000 $ 300,000 $ 300,000 $ 400,000  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 8,452,430   8,452,430    
Common shares available for issuance (in shares) 11,196,176   11,196,176    
Expiration period of options, minimum term     7 years    
Expiration period of options, maximum term     10 years    
Unrecognized compensation cost relating to unvested stock awards $ 21,200,000   $ 21,200,000    
Unvested stock awards compensation cost, weighted average recognition period     2 years 4 months 17 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