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