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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, 2019
Sep. 30, 2018
Jun. 30, 2019
Income Taxes [Line Items]            
Income taxes payable       $ 90,968   $ 73,248
Income taxes paid       30,937 $ 125,005  
Income tax expense (benefit)       $ 30,439 $ 33,144  
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 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 2017 [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 2017 [Member]            
Income Taxes [Line Items]            
Tax year under audit       2017