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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%

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