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Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Goodwill and Other Intangible Assets |  |
Beginning Balance | $ 504,853 | $ 408,100
Acquisition activity | 1,000 | 97,400
Foreign currency translation and other | (13,200) | (600)
Ending Balance | 492,709 | 504,853
USG |  |
Goodwill and Other Intangible Assets |  |
Beginning Balance | 366,500 | 271,900
Acquisition activity | (4,700) | 95,200
Foreign currency translation and other | (13,100) | (600)
Ending Balance | 348,700 | 366,500
Test |  |
Goodwill and Other Intangible Assets |  |
Beginning Balance | 34,100 | 34,100
Foreign currency translation and other | (100) |
Ending Balance | 34,000 | 34,100
A&D |  |
Goodwill and Other Intangible Assets |  |
Beginning Balance | 104,300 | 102,100
Acquisition activity | 5,700 | 2,200
Ending Balance | $ 110,000 | $ 104,300

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