GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in carrying amount of goodwill (Details) $ in Thousands	9 Months Ended
Jun. 30, 2019 USD ($)
Changes in goodwill
Goodwill, Beginning Balance	$ 381,652
Goodwill, Ending Balance	381,683
USG
Changes in goodwill
Goodwill, Beginning Balance	254,100
Foreign currency translation	200
Goodwill, Ending Balance	254,300
Test
Changes in goodwill
Goodwill, Beginning Balance	34,100
Goodwill, Ending Balance	34,100
Filtration
Changes in goodwill
Goodwill, Beginning Balance	73,700
Goodwill, Ending Balance	73,700
Technical Packaging
Changes in goodwill
Goodwill, Beginning Balance	19,800
Foreign currency translation	(200)
Goodwill, Ending Balance	$ 19,600

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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-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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