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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Apr. 30, 2018
Income Taxes [Line Items]
Income taxes payable	$ 160,427		$ 76,137	$ 160,427
Tax Year 2018 [Member] | Scenario, Plan [Member]
Income Taxes [Line Items]
Income tax expense from transition tax			$ 500	$ 138,000
Australian Taxation Office [Member]
Income Taxes [Line Items]
Tax liabilities related to assessments	$ 75,900	$ 151,700
Interest related to assessments		$ 38,400
Percentage of penalties on additional income tax	50.00%
Income taxes payable					$ 75,900
Australian Taxation Office [Member] | Minimum [Member]
Income Taxes [Line Items]
Tax year under audit		2009	2014
Australian Taxation Office [Member] | Maximum [Member]
Income Taxes [Line Items]
Tax year under audit		2013	2017

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Income Tax Penalties Percentage

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations.

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