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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Expected statutory rate		26.50%	26.50%	26.50%
Expected provision for income taxes		$ 102,323	$ 66,131	$ 77,056
Effect of foreign tax rate differences		2,352	8,647	(71,478)
Change in valuation allowance		1,779	520	(34,999)
Amortization of deferred charges		4,242	6,298	11,316
Effect of permanent differences		4,332	3,673	10,711
Effect of changes in unrecognized tax benefits		5,543	14,427	(264)
Effect of withholding taxes		7,927	3,845	3,457
Difference in tax filings from provision		1,321	(7,836)	8,959
Effect of U.S. tax reform		19,037	0	0
Other Items		(5,030)	4,045	1,524
Impact of internal reorganization of subsidiaries	$ (876,100)	0	(876,114)	0
Provision for (recovery of) income taxes		$ 143,826	$ (776,364)	$ 6,282

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