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Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Goodwill and Other Intangible Assets |  |
Beginning Balance | $ 492,709 | $ 504,900
Acquisition activity | 5,600 | 1,000
Foreign currency translation and other | 4,900 | (13,200)
Ending Balance | 503,177 | 492,709
A&D |  |
Goodwill and Other Intangible Assets |  |
Beginning Balance | 110,000 | 104,300
Acquisition activity | 5,600 | 5,700
Ending Balance | 115,600 | 110,000
Test |  |
Goodwill and Other Intangible Assets |  |
Beginning Balance | 34,000 | 34,100
Foreign currency translation and other |  | (100)
Ending Balance | 34,000 | 34,000
USG |  |
Goodwill and Other Intangible Assets |  |
Beginning Balance | 348,700 | 366,500
Acquisition activity |  | (4,700)
Foreign currency translation and other | 4,900 | (13,100)
Ending Balance | $ 353,600 | $ 348,700

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