Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 235,141	$ 237,393	$ 206,145
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178,583	179,917	155,370
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,558	57,476	$ 50,775
Level 1 [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178,583	179,917
Level 1 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,332	2,130
Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,261	55,346
Level 3 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,965
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,513	5,500
Cash and Cash Equivalents \| Level 1 [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,181	3,370
Cash and Cash Equivalents \| Level 1 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,332	2,130
Debt Security, Corporate, US
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120,010	121,581
Debt Security, Corporate, US \| Level 1 [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120,010	121,581
Domestic Equity Large Cap Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,001	33,454
Domestic Equity Large Cap Fund \| Level 1 [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,001	33,454
International Equity Large Cap Growth Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,391	21,512
International Equity Large Cap Growth Fund \| Level 1 [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,391	21,512
Private Equity Funds Foreign Japan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,000	1,939
Private Equity Funds Foreign Japan \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,000	1,939
Private Equity Funds Pooled Funds Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,818	1,786
Private Equity Funds Pooled Funds Foreign \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,818	1,786
Fixed Income Funds Japan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,046	4,157
Fixed Income Funds Japan \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,046	4,157
Fixed Income Funds Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,397	1,409
Fixed Income Funds Foreign \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,397	1,409
U.K. Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,965
U.K. Insurance Contract \| Level 3 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 35,965
Corporate Debt Securities United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		17,085
Corporate Debt Securities United Kingdom \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		17,085
Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		12,049
Pooled funds: Index linked U.K. government securities fund [Member] \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		12,049
Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		14,924
Pooled funds: Index linked U.K. long-term government securities fund [Member] \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		14,924
Pooled funds: Index U.K Long-term Government Securities Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1,997
Pooled funds: Index U.K Long-term Government Securities Fund [Member] \| Level 2 [Member] \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 1,997