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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