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EMPLOYEE BENEFIT PLANS - Summary of Allocation of Pension Plan Assets (Details)	Sep. 30, 2021	Sep. 30, 2020
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	100.00%	100.00%
Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	100.00%	100.00%
Equity Securities | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	30.00%	46.00%
Equity Securities | Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	0.00%	0.00%
Fixed Income Securities | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	70.00%	51.00%
Fixed Income Securities | Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	16.00%	21.00%
Other | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	0.00%	3.00%
Other | Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation percentage	84.00%	79.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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