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Income Taxes (Tax Expense and Effective Tax Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Income Taxes        
Earnings before income taxes $ 54,366 $ 57,591 $ 82,322 $ 114,663
Income tax expense $ 13,542 $ 13,736 $ 15,678 $ 27,024
Effective tax rate 24.90% 23.90% 19.00% 23.60%