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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details)
 3 Months Ended 12 Months Ended
Jan. 24, 2017
Dec. 21, 2016
shares
Dec. 31, 2016
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jul. 26, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock split ratio 2 2          
Share sub-division (in shares)   1          
Dividends declared per common share (in dollars per share) | $ / shares       $ 0.477 $ 0.415 $ 0.35875  
Payments of dividends | $       $ 120,581,000 $ 99,262,000 $ 87,629,000  
Preference shares issued (in shares)       0      
Common shares repurchased (in shares)       244,240 450,000 480,444  
Stock repurchase amount | $       $ 8,198,000 $ 10,627,000 $ 10,557,000  
Issuance of treasury stock (in shares)       409,922 434,156 755,550  
Authorized repurchase amount | $             $ 200,000,000
Common shares repurchased and cancelled during period, shares (in shares)       0 2,952,496 0  
Long Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Issuance of treasury stock (in shares)     339,922