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Goodwill and Other Intangible Assets - Goodwill Narrative (Details) - Aerospace Reporting Unit [Member] - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Goodwill, Impairment Loss |  | $ 60.2
Goodwill [Member] |  |
Goodwill [Line Items] |  |
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach | 50.00% | 50.00%
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach | 50.00% | 50.00%
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 15.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Goodwill [Member] |  |
Goodwill [Line Items] |  |
Fair value inputs, valuation method, residual growth rate | 3.00% | 3.00%
Measurement Input, Discount Rate [Member] | Goodwill [Member] |  |
Goodwill [Line Items] |  |
Fair value inputs, valuation method, discount rate | 9.50% | 10.30%

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