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Business Segment Information - Schedule Of Depreciation And Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Depreciation and Amortization | $ 55,409 | $ 50,523 | $ 48,343
Corporate |  |  |
Depreciation and Amortization | 20,800 | 18,600 | 19,200
Operating Segments | A&D |  |  |
Depreciation and Amortization | 13,600 | 12,600 | 11,100
Operating Segments | USG |  |  |
Depreciation and Amortization | 15,700 | 14,000 | 12,600
Operating Segments | Test |  |  |
Depreciation and Amortization | $ 5,300 | $ 5,300 | $ 5,400

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