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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
Sep. 23, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (in shares)   9,029,680   9,029,680   8,354,816
Award vesting period       3 years    
Unrecognized compensation cost relating to unvested stock awards   $ 21,600,000   $ 21,600,000    
Unvested stock awards compensation cost, weighted average recognition period       2 years 2 months 8 days    
Cash proceeds from exercise of options granted   2,100,000 $ 2,000,000 $ 4,500,000 $ 6,300,000  
Tax benefit realized from exercise of options   $ 300,000 $ 0 $ 400,000 $ 200,000  
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized (in shares) 8,000,000          
Options outstanding (in shares)   9,029,680   9,029,680    
Common shares available for issuance (in shares)   12,621,082   12,621,082    
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