Segment Information (Summary of Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,020,772	$ 3,903,336
Property, plant and equipment, net	965,205	997,415
Other assets	279,610	265,435
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	103,949	106,380
Other assets	652,262	515,029
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,735,452	1,752,516
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	$ 1,529,109	$ 1,529,411