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EMPLOYEE BENEFIT PLANS - Target Allocation and Asset Allocation for the Pension Plan (Details)	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%
Asset allocation	100.00%	100.00%
U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	17.00%
Asset allocation	46.00%	42.00%
International equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	12.00%
Asset allocation	17.00%	22.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	71.00%
Asset allocation	37.00%	36.00%

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
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