GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in carrying amount of goodwill (Details)	9 Months Ended
Jun. 30, 2020 USD ($)
Changes in goodwill
Goodwill, Beginning Balance	$ 390,256,000
Foreign currency translation	(400,000)
Goodwill, Ending Balance	389,942,000
Impairment	0
USG
Changes in goodwill
Goodwill, Beginning Balance	254,000,000.0
Foreign currency translation	(300,000)
Goodwill, Ending Balance	253,700,000
Test
Changes in goodwill
Goodwill, Beginning Balance	34,100,000
Foreign currency translation	(100,000)
Goodwill, Ending Balance	34,000,000.0
Aerospace & Defense
Changes in goodwill
Goodwill, Beginning Balance	102,200,000
Goodwill, Ending Balance	$ 102,200,000

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 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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