Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member]	Sep. 30, 2025	Sep. 30, 2024
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
United States [Member] \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	31.60%	30.50%
United States [Member] \| Equity Securities \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.10%	2.30%
United States [Member] \| Equity Securities \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	51.10%	51.10%
United States [Member] \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	67.20%	67.60%
United States [Member] \| Debt Securities \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	58.90%	58.90%
United States [Member] \| Debt Securities \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	96.80%	96.70%
United States [Member] \| Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	1.20%	1.90%
United States [Member] \| Other Investment Asset \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%
United States [Member] \| Other Investment Asset \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges		0.00%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
United Kingdom \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	0.00%	95.80%
United Kingdom \| Debt Securities \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	90.00%
United Kingdom \| Debt Securities \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges		100.00%
United Kingdom \| Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	76.20%	0.00%
United Kingdom \| Insurance Contract \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	90.00%
United Kingdom \| Insurance Contract \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	100.00%	0.00%
United Kingdom \| Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	23.80%	4.20%
United Kingdom \| Other Investment Asset \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United Kingdom \| Other Investment Asset \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges		10.00%
Japan
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Japan \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	40.80%	39.70%
Japan \| Equity Securities \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	36.00%	36.00%
Japan \| Equity Securities \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	44.00%	44.00%
Japan \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	58.30%	59.40%
Japan \| Debt Securities \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	55.00%	55.00%
Japan \| Debt Securities \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	63.00%	63.00%
Japan \| Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	1.00%	0.90%
Japan \| Other Investment Asset \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
Japan \| Other Investment Asset \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.00%	2.00%

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.

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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.

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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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