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Capital Structure | 9 Months Ended
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Mar. 31, 2018
Capital Structure [Abstract] |
Capital Structure | 11. Capital structure The following table presents a reconciliation between the number of shares, net of treasury, presented in the unaudited condensed consolidated statement of changes in equity during the nine months ended March 31, 2018 and 2017, respectively, and the number of shares, net of treasury, excluding non-vested equity shares that have not vested during the nine months ended March 31, 2018 and 2017, respectively:
| March 31, |  | March 31, |
| 2018 |  | 2017 |
Number of shares, net of treasury: |  |  |  |
Statement of changes in equity | 56,855,187 |  | 57,590,085 |
Less: Non-vested equity shares that have not vested (Note 13) | (934,673 | ) | (904,356 | )
Number of shares, net of treasury excluding non-vested |  |  |  |
equity shares that have not vested | 55,920,514 |  | 56,685,729 |
Common stock repurchases Executed under share repurchase authorizations The Company did not repurchase any of its shares during the three and nine months ended March 31, 2018, or during the three months ended March 31, 2017. In February 2016, the Company's board of directors approved the replenishment of its share repurchase authorization to repurchase up to an aggregate of $100 million of common stock. The authorization has no expiration date. On June 29, 2016, the Company adopted a Rule 10b5-1 trading plan for the purpose of repurchasing approximately $50 million of its common stock, which was included within the original share repurchase authorization. During the nine months ended March 31, 2017, the Company repurchased 3,137,609 shares for approximately $31.6 million under its share repurchase authorizations.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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