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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 us-gaap_DeferredTaxAssetsValuationAllowance |
Unrecognized tax benefits that would impact effective tax rate | 3.2 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 3.2 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized tax benefits, income tax penalties and interest accrued | 1.8 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | $ 1.6 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
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 of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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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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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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