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Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,007,169	$ 3,956,526
Property, plant and equipment, net	1,033,578	1,058,775
Other assets	217,163	198,517
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	108,669	114,887
Other assets	471,967	379,541
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,905,846	1,900,657
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,520,687	$ 1,561,441

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