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Segment Information (Narrative) (Details) - segment | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Entity Wide Revenue Major Customer [Line Items] |  |  |
Number of Reportable Segments | 2 |  |
General Electric [Member] | Sales [Member] | Product Concentration Risk [Member] |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |
Percentage of total attributable to major customer | 11.00% | 11.00% | 14.00%
General Electric [Member] | Trade Accounts Receivable [Member] | Product Concentration Risk [Member] |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |
Percentage of total attributable to major customer | 10.00% | 9.00% |
Boeing Company [Member] | Sales [Member] | Product Concentration Risk [Member] |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |
Percentage of total attributable to major customer | 13.00% | 14.00% | 15.00%
Boeing Company [Member] | Trade Accounts Receivable [Member] | Product Concentration Risk [Member] |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |
Percentage of total attributable to major customer | 14.00% | 13.00% |

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