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Summary of Significant Accounting Policies (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Valuation Allowance |  | $ 190.4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 15.8 |

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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=65882285&loc=d3e32537-109319 + 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=65882285&loc=SL6600010-109319 + Details
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