Business Segment Information - Schedule Of Identifiable Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Identifiable Assets	$ 1,683,214	$ 1,654,456
Operating Segments [Member] | A&D
Identifiable Assets	354,700	295,200
Operating Segments [Member] | USG
Identifiable Assets	254,900	220,000
Operating Segments [Member] | Test
Identifiable Assets	167,600	174,600
Corporate
Other Assets	$ 906,000	$ 964,700