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Income Taxes (Tax Expense and Effective Tax Rate) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Income Taxes        
Earnings before income taxes $ 54,038 $ 46,487 $ 94,214 $ 77,962
Income tax expense $ 15,287 $ 14,397 $ 27,046 $ 23,473
Effective tax rate 28.30% 31.00% 28.70% 30.10%