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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income taxes payable |  |  |  | $ 68,278 |  | $ 68,278 |  | $ 73,248
Income taxes paid |  |  |  |  |  | 150,801 | $ 211,816 |
Income tax expense (benefit) |  |  |  | $ 28,518 | $ 32,513 | $ 77,155 | $ 87,291 |
Australian Taxation Office [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax liabilities related to assessments | $ 75,900 | $ 75,900 | $ 151,700 |  |  |  |  |
Interest related to assessments |  |  | $ 38,400 |  |  |  |  |
Percentage of penalties on additional income tax | 50.00% |  |  |  |  |  |  |
Income taxes paid |  | $ 75,900 |  |  |  |  |  |
Australian Taxation Office [Member] | Tax Year 2014 To 2018 [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax year under audit |  |  |  |  |  | 2018 |  |
Australian Taxation Office [Member] | Minimum [Member] | Tax Year 2009 To 2013 [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax year under audit |  |  | 2009 |  |  | 2009 |  |
Australian Taxation Office [Member] | Minimum [Member] | Tax Year 2014 To 2018 [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax year under audit |  |  |  |  |  | 2014 |  |
Australian Taxation Office [Member] | Maximum [Member] | Tax Year 2009 To 2013 [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax year under audit |  |  | 2013 |  |  | 2013 |  |
Australian Taxation Office [Member] | Maximum [Member] | Tax Year 2014 To 2018 [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax year under audit |  |  |  |  |  | 2018 |  |

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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=119400593&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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