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Income Taxes (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
Income Tax Contingency [Line Items] |  |
Unrecognized tax benefits that would impact effective tax rate | $ 3.9 | $ 3.9
Unrecognized tax benefits, income tax penalties and interest accrued | $ 2.5 | $ 2.3
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 |

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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