Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,366,259	$ 4,010,203
Property, plant and equipment, net	921,355	913,094
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	120,202	104,962
Other assets	792,544	585,490
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,890,089	1,829,410
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,563,424	$ 1,490,341