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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, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
Earnings before income taxes	$ 50,336	$ 54,038	$ 88,873	$ 94,214
Income tax expense	$ 7,890	$ 15,287	$ 19,059	$ 27,046
Effective tax rate	15.70%	28.30%	21.40%	28.70%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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