GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in carrying amount of goodwill (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2022 USD ($)
Goodwill and Other Intangible Assets
Beginning Balance	$ 492,709
Foreign currency translation and other	5,700
Ending Balance	498,383
USG
Goodwill and Other Intangible Assets
Beginning Balance	348,700
Foreign currency translation and other	5,700
Ending Balance	354,400
Test
Goodwill and Other Intangible Assets
Beginning Balance	34,000
Ending Balance	34,000
Aerospace & Defense
Goodwill and Other Intangible Assets
Beginning Balance	110,000
Ending Balance	$ 110,000