Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,711,850	$ 4,368,915
Property, plant and equipment, net	942,103	940,715
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	118,247	120,946
Other assets	1,034,129	801,967
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	2,043,800	1,936,507
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,515,674	$ 1,509,495