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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020
Income Taxes [Line Items] |  |  |  |  |  |
Income taxes payable |  |  |  | $ 68,053 |  | $ 64,755
Income taxes paid |  |  |  | 51,370 | $ 30,937 |
Income tax expense (benefit) |  |  |  | $ 37,482 | $ 30,439 |
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% |  |  |  |  |

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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=120400017&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=120398452&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=120391452&loc=d3e13212-122682 + Details
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- Definition Estimated amount of loss resulting from an adverse tax position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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