Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,130,805	$ 4,010,203
Property, plant and equipment, net	931,253	913,094
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	122,740	104,962
Other assets	594,693	585,490
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,838,875	1,829,410
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,574,497	$ 1,490,341