Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,088,655	$ 3,903,336
Property, plant and equipment, net	952,800	997,415
Other assets	283,016	265,435
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	102,576	106,380
Other assets	741,699	515,029
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,711,257	1,752,516
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,533,123	$ 1,529,411