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Business Segment Information - Schedule Of Identifiable Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Identifiable Assets	$ 1,838,620	$ 1,683,214
Operating Segments | A&D
Identifiable Assets	391,200	354,700
Operating Segments | USG
Identifiable Assets	294,500	254,900
Operating Segments | Test
Identifiable Assets	180,900	167,600
Corporate
Other Assets	$ 972,000	$ 906,000

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