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Retirement Benefits (Schedule of Assumptions Used) (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Pension Plan [Member] | United States [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	5.50%	5.05%	6.20%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate	5.05%	6.20%	5.70%
Long-term rate of return on plan assets	6.28%	6.03%	5.53%
Defined Benefit Pension Plan [Member] | United Kingdom
Weighted-average assumptions to determine benefit obligation:
Discount rate	4.90%	5.28%	5.85%
Rate of compensation increase	3.20%	3.60%	4.00%
Weighted-average assumptions to determine periodic benefit costs:
Long-term rate of return on plan assets	4.70%	4.90%	4.80%
Discount rate - service cost	5.41%	5.91%	4.99%
Discount rate - interest cost	5.13%	5.84%	5.71%
Rate of compensation increase	3.40%	3.40%	3.60%
Defined Benefit Pension Plan [Member] | Japan
Weighted-average assumptions to determine benefit obligation:
Discount rate	2.90%	1.92%	2.01%
Rate of compensation increase	4.00%	2.00%	2.00%
Weighted-average assumptions to determine periodic benefit costs:
Long-term rate of return on plan assets	3.75%	3.25%	2.75%
Discount rate - service cost	2.10%	2.20%	1.78%
Discount rate - interest cost	1.53%	1.58%	1.17%
Rate of compensation increase	3.00%	3.00%	2.00%
Defined Benefit Pension Plan [Member] | Germany [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	4.05%	3.58%	4.27%
Rate of compensation increase	2.50%	2.50%	2.50%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate - service cost	3.64%	4.23%	3.95%
Discount rate - interest cost	3.47%	4.29%	3.91%
Rate of compensation increase	2.50%	2.50%	2.50%
Other Postretirement Benefit Plans [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	5.30%	5.00%	6.25%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate	5.00%	6.25%	5.70%

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
-Topic 715
-SubTopic 20
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-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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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)
-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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-Subparagraph (k)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

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)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

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
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-8

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

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- Definition

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
-Paragraph 5
-Subparagraph (j)(2)
-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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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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The interest rate used to adjust for the time value of money associated with the interest rate cost.

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