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Benefit Plans - Weighted Average Assumptions Determining Pension Plan (Details) - Pension Plans	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
United States
Net Cost
Discount rate:	4.98%	6.01%	5.62%
Expected return on plan assets:	7.50%	7.50%	7.25%
Rate of compensation increase:	4.00%	4.00%	4.51%
Cash balance plan interest crediting rate:	4.00%	4.00%	4.00%
Benefit Obligation
Discount rate:	5.25%	4.98%	6.01%
Rate of compensation increase:	4.00%	4.00%	4.00%
Cash balance plan interest crediting rate:	4.50%	4.00%	4.00%
International plans
Net Cost
Discount rate:	3.88%	4.52%	4.26%
Expected return on plan assets:	5.36%	5.30%	5.02%
Rate of compensation increase:	2.81%	2.81%	2.86%
Cash balance plan interest crediting rate:	2.21%	2.16%	1.98%
Benefit Obligation
Discount rate:	4.25%	3.88%	4.62%
Rate of compensation increase:	2.75%	2.81%	2.86%
Cash balance plan interest crediting rate:	2.44%	2.21%	2.21%

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(2)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

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- Definition

Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(1)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(3)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

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Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
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