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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Dividends declared per common share (in dollars per share) $ 0.5478 $ 0.477000 $ 0.4150
Payments of dividends $ 145,613 $ 120,581 $ 99,262
Preference shares issued (in shares) 0    
Common shares repurchased (in shares) 0 244,240 450,000
Purchase of treasury stock   $ 8,200 $ 10,600
Issuance of treasury stock (in shares) 411,276 409,922 434,156