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Business Segment Information - Schedule Of Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Capital Expenditures | $ 22,400 | $ 32,100 | $ 26,700
Goodwill | 503,177 | 492,709 | 504,900
A&D |  |  |
Goodwill | 115,600 | 110,000 | 104,300
USG |  |  |
Goodwill | 353,600 | 348,700 | 366,500
Test |  |  |
Goodwill | 34,000 | 34,000 | 34,100
Operating Segments [Member] | A&D |  |  |
Capital Expenditures | 12,900 | 9,400 | 10,400
Operating Segments [Member] | USG |  |  |
Capital Expenditures | 4,900 | 14,400 | 11,600
Operating Segments [Member] | Test |  |  |
Capital Expenditures | 4,500 | 8,300 | 4,700
Corporate |  |  |
Capital Expenditures | $ 100 | $ 0 | $ 0

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