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Income Taxes Income Taxes Narrative (Details) (USD $) In Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010
Deferred Tax Liability Not Recognized [Line Items] |  |
Liability for uncertain tax positions | $ 3.0 | $ 2.9
Unrecognized tax benefits that would impact effective tax rate | 1.2 |
Interest on income taxes accrued | 1.6 | 1.2
Income tax penalties accrued | $ 0.3 | $ 0.3
Returns open to examination, minimum (years) | 3 years |
Returns open to examination, maximum (years) | 5 years |
Income Tax Examination, Returns Open to Examination, State Impact of Federal Changes, Maximum | 2 years |

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