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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Income Taxes [Line Items]              
Income taxes payable $ 160,427     $ 52,739   $ 52,739  
Income taxes paid           211,816 $ 75,119
Income tax expense (benefit)       32,513 $ 20,018 87,291 174,617
Income tax expense from transition tax       $ 3,300 5,400 $ 4,500 132,200
Australian Taxation Office [Member]              
Income Taxes [Line Items]              
Tax liabilities related to assessments     $ 151,700        
Interest related to assessments     $ 38,400   $ 38,400   $ 38,400
Percentage of penalties on additional income tax 50.00%            
Penalties related to assessments $ 75,900            
Income taxes paid   $ 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