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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%

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