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Income Taxes Income Taxes Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Deferred Tax Liability Not Recognized [Line Items]
Liability for uncertain tax positions	$ 3.2	$ 3.0
Unrecognized tax benefits that would impact effective tax rate	1.1
Interest on income taxes accrued	2.0	1.6
Income tax penalties accrued	$ 0.3	$ 0.3
Returns open to examination, minimum (years)	3 years
Returns open to examination, maximum (years)	5 years
Returns open to examination, state impact of federal changes, maximum (years)	2 years

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The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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