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Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Consolidated total assets | $ 4,060,276 | $ 3,956,526
Property, plant and equipment, net | 1,019,078 | 1,058,775
Other assets | 295,273 | 198,517
Unallocated Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | 105,881 | 114,887
Other assets | 520,933 | 379,541
Aerospace [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated total assets | 1,892,325 | 1,900,657
Industrial [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Consolidated total assets | $ 1,541,137 | $ 1,561,441

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