Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,493,469	$ 4,368,915
Property, plant and equipment, net	929,357	940,715
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	119,454	120,946
Other assets	893,904	801,967
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	2,013,509	1,936,507
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,466,602	$ 1,509,495