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Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Taxes |  |  |  |
Earnings before income taxes | $ 68,687 | $ 63,408 | $ 165,982 | $ 145,730
Income tax expense | $ 15,061 | $ 12,361 | $ 27,703 | $ 28,039
Effective tax rate | 21.90% | 19.50% | 16.70% | 19.20%

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