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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Cash Dividends |  |  |
Dividends declared per common share (in dollars per share) | $ 0.6300 | $ 0.5478 | $ 0.4770
Payments of dividends | $ 168,859,000 | $ 145,613,000 | $ 120,581,000
Share Capital |  |  |
Preference shares issued (in shares) | 0 |  |
Treasury Stock |  |  |
Purchase of treasury stock (in shares) | 726,059 | 0 | 244,240
Purchase of treasury stock | $ 26,499,000 | $ 0 | $ 8,198,000
Issuance of treasury stock (in shares) | 613,524 | 411,276 | 409,922

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