GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in carrying amount of goodwill (Details) $ in Thousands	3 Months Ended
Dec. 31, 2020 USD ($)
Changes in goodwill
Goodwill, Beginning Balance	$ 408,063
Acquisition activity	2,300
Foreign currency translation	800
Goodwill, Ending Balance	411,161
Impairment	$ 0
Fair value exceeded carrying value percentage	10.00%
Goodwill, Gross	$ 30,000
USG
Changes in goodwill
Goodwill, Beginning Balance	271,900
Foreign currency translation	800
Goodwill, Ending Balance	272,700
Test
Changes in goodwill
Goodwill, Beginning Balance	34,100
Goodwill, Ending Balance	34,100
Aerospace & Defense
Changes in goodwill
Goodwill, Beginning Balance	102,100
Acquisition activity	2,300
Goodwill, Ending Balance	$ 104,400

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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