GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in carrying amount of goodwill (Details) $ in Thousands	6 Months Ended
Mar. 31, 2020 USD ($)
Changes in goodwill
Goodwill, Beginning Balance	$ 390,256
Foreign currency translation	(700)
Goodwill, Ending Balance	389,630
USG
Changes in goodwill
Goodwill, Beginning Balance	254,000
Foreign currency translation	(600)
Goodwill, Ending Balance	253,400
Test
Changes in goodwill
Goodwill, Beginning Balance	34,100
Foreign currency translation	(100)
Goodwill, Ending Balance	34,000
Aerospace & Defense
Changes in goodwill
Goodwill, Beginning Balance	102,200
Goodwill, Ending Balance	$ 102,200

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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