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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Intangible Assets [Line Items] |  |  |
Write-off from impairment of goodwill | $ 0 | $ 0 | $ 116,000,000.0
Write-off from impairment of intangible assets | 0 | 24,200,000 | 35,400,000
Amortization of intangible assets | $ 65,100,000 | 55,300,000 | 70,800,000
Coevorden Operations |  |  |
Intangible Assets [Line Items] |  |  |
Impairment loss recognized on definite-lived tangible assets |  | 7,600,000 |
Coevorden Operations | Tradenames |  |  |
Intangible Assets [Line Items] |  |  |
Write-off from impairment of intangible assets |  | $ 16,600,000 |
HPC |  |  |
Intangible Assets [Line Items] |  |  |
Write-off from impairment of goodwill |  |  | 116,000,000
Amortization of intangible assets |  |  | 15,500,000
HPC | Tradenames |  |  |
Intangible Assets [Line Items] |  |  |
Write-off from impairment of intangible assets |  |  | 18,800,000
GPC | Tradenames |  |  |
Intangible Assets [Line Items] |  |  |
Write-off from impairment of intangible assets |  |  | $ 16,600,000

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising 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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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