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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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