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Goodwill and Other Intangible Assets - Intangibles Narrative (Details) - Trademarks and Trade Names [Member] - Aerospace [Member] - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items] |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 38.7
Trade names, fair value exceeds carrying value, percentage | 9.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Fair value inputs, valuation method, residual growth rate | 3.00% | 3.00%
Measurement Input, Discount Rate [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Fair value inputs, valuation method, discount rate | 9.50% | 10.30%

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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