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Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Income Taxes        
Earnings before income taxes $ 90,168 $ 48,647 $ 151,683 $ 86,134
Income tax expense $ 12,589 $ 10,158 $ 24,984 $ 29,385
Effective tax rate 14.00% 20.90% 16.50% 34.10%