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Segment Information (Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 2,785,751 | $ 2,757,109
Other unallocated assets | 254,734 | 234,301
Property, plant and equipment, net | 943,433 | 922,043
Aerospace [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,723,472 | 1,722,789
Industrial [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 686,329 | 695,264
Unallocated Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 121,216 | $ 104,755

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