Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Sep. 30, 2014
Income Tax Contingency [Line Items]
Deferred tax assets, valuation allowance	1.5
Unrecognized tax benefits that would impact effective tax rate	3.2	3.2
Unrecognized tax benefits, income tax penalties and interest accrued	1.8	$ 1.6
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	3 years
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations	5 years