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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%