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Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]        
Earnings before income taxes $ 45,016 $ 92,314 $ 213,763 $ 243,997
Income tax expense $ 6,551 $ 26,207 $ 30,607 $ 51,191
Effective tax rate 14.60% 28.40% 14.30% 21.00%