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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes [Line Items] |  |  |  |  |  |
Additional income tax benefits as an increase to earnings |  |  |  | $ 39,534 | $ 26,658 | $ 17,078
Income taxes paid |  |  |  | 180,359 | 242,860 | 170,653
Income taxes payable |  |  |  | 64,755 | 73,248 |
Income tax expense from transition tax |  |  |  | $ 124,602 | $ 127,540 | $ 68,858
Payable period of additional tax expense |  |  |  | 8 years |  |
U.S. Federal income tax rate |  |  |  | 21.00% | 21.00% | 28.00%
Increase to net earnings from tax holidays and tax incentives program |  |  |  | $ 43,800 | $ 20,300 |
Increase to net earnings per diluted share from tax holidays and tax incentives program |  |  |  | $ 0.30 | $ 0.14 |
Additional tax expense |  |  |  |  | $ 6,038 | $ 126,753
Undistributed earnings |  |  |  | $ 3,000,000 |  |
Tax cuts and jobs act, income tax expense (benefit) |  |  |  |  |  | 138,000
Transition tax |  |  |  |  | $ 6,000 |
Extraordinary Dispositions [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Amount of deferred taxes that would have been recognized if the earnings has not been permanently reinvested |  |  |  | $ 194,400 |  |
Tax Year 2018 [Member] | Scenario, Plan [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Additional income tax expense from adjustment of deferred tax assets |  |  |  |  |  | 11,100
Transition tax |  |  |  |  |  | 126,900
Australian Taxation Office [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Percentage of penalties on additional income tax | 50.00% |  |  |  |  |
Tax liabilities related to assessments | $ 75,900 | $ 75,900 | $ 151,700 |  |  |
Income taxes paid |  | $ 75,900 |  |  |  |
Interest related to assessments |  |  | 38,400 |  |  |
Income taxes payable | $ 75,900 |  | $ 151,700 |  |  | 75,900
Percentage of recognized tax benefit for uncertain tax position |  |  |  | 50.00% |  |
Australian Taxation Office [Member] | Minimum [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax year under audit |  |  |  |  | 2009 |
Australian Taxation Office [Member] | Maximum [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax year under audit |  |  |  |  | 2013 |
Domestic Tax Authority [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 30,400 |  |
Amount of deferred taxes that would have been recognized if the earnings has not been permanently reinvested |  |  |  | 5,200 |  |
Tax cuts and jobs act, income tax expense (benefit) |  |  |  |  |  | $ 138,000
Foreign Tax Authority [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | 6,800 |  |
Tax cuts and jobs act, income tax expense (benefit) |  |  |  | 6,000 | $ 126,900 |
Valuation Allowance | Foreign Tax Authority [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | 1,600 |  |
Capital loss |  |  |  | $ 15,300 |  |

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