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POST EMPLOYMENT BENEFITS - Plan assets distribution (Details)	Sep. 30, 2025	Sep. 30, 2024
Plan assets distribution
Plan assets distribution (in percent)	100.00%	100.00%
Cash
Plan assets distribution
Plan assets distribution (in percent)	11.03%	2.69%
Equity securities
Plan assets distribution
Plan assets distribution (in percent)	0.00%	3.47%
Debt securities
Plan assets distribution
Plan assets distribution (in percent)	88.97%	91.05%
Real estate mutual fund
Plan assets distribution
Plan assets distribution (in percent)	0.00%	1.10%
Other
Plan assets distribution
Plan assets distribution (in percent)	0.00%	1.69%

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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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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