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

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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