Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2016	Sep. 30, 2015
Income Tax Contingency [Line Items]
Valuation allowance increase	$ 1.1
Unrecognized tax benefits that would impact effective tax rate	2.4	$ 1.8
Unrecognized tax benefits, income tax penalties and interest accrued	$ 2.0	$ 1.8
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