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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in carrying amount of goodwill (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($)
Changes in goodwill |  |
Goodwill, Beginning Balance |  | $ 408,063
Acquisition activity |  | 2,200
Foreign currency translation |  | 1,400
Goodwill, Ending Balance | $ 411,732 | 411,732
Impairment | $ 0 | $ 0
Fair value exceeded carrying value percentage | 10.00% | 10.00%
USG |  |
Changes in goodwill |  |
Goodwill, Beginning Balance |  | $ 271,900
Foreign currency translation |  | 1,400
Goodwill, Ending Balance | $ 273,300 | 273,300
Test |  |
Changes in goodwill |  |
Goodwill, Beginning Balance |  | 34,100
Goodwill, Ending Balance | 34,100 | 34,100
Aerospace & Defense |  |
Changes in goodwill |  |
Goodwill, Beginning Balance |  | 102,100
Acquisition activity |  | 2,200
Goodwill, Ending Balance | 104,300 | 104,300
Mayday |  |
Changes in goodwill |  |
Goodwill, Gross | 30,000 | 30,000
Westland |  |
Changes in goodwill |  |
Goodwill, Gross | $ 18,000 | $ 18,000

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