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Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Sep. 30, 2010
Income Taxes
Uncertain tax positions reserves	$ 16,700,000		$ 16,700,000		$ 9,968,000
Estimated accrued interest and penalties	4,800,000		4,800,000
Valuation allowance	$ 1,700,000		$ 5,100,000
Effective income tax rate	14.00%	30.00%	18.00%	21.00%

- 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 amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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