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Significant Accounting Policies - Investment and other assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Investment in joint-venture companies and company's equity in undistributed earnings	$ 304,389	$ 341,869
Share of earnings from investments in joint-venture companies	$ 50,473	$ 42,352	$ 25,650
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage (or less)	50.00%

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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