Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 237,393	$ 206,145	$ 202,060
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	179,917	155,370	154,481
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	57,476	50,775	$ 47,579
Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	179,917	155,370
Level 1 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,130	149
Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55,346	50,626
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,500	2,534
Cash and Cash Equivalents | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,370	2,385
Cash and Cash Equivalents | Level 1 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,130	149
Debt Security, Corporate, US
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	121,581	103,401
Debt Security, Corporate, US | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	121,581	103,401
Domestic Equity Large Cap Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,454	31,136
Domestic Equity Large Cap Fund | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,454	31,136
International Equity Large Cap Growth Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,512	18,448
International Equity Large Cap Growth Fund | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,512	18,448
Private Equity Funds Foreign Japan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,939	1,830
Private Equity Funds Foreign Japan | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,939	1,830
Private Equity Funds Pooled Funds Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,786	1,600
Private Equity Funds Pooled Funds Foreign | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,786	1,600
Fixed Income Funds Japan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,157	3,785
Fixed Income Funds Japan | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,157	3,785
Fixed Income Funds Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,409	1,287
Fixed Income Funds Foreign | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,409	1,287
Global Target Return Equity Bond Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		8,719
Global Target Return Equity Bond Fund | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		8,719
Corporate Debt Securities United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,085	14,319
Corporate Debt Securities United Kingdom | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,085	14,319
Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,049	14,601
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	14,601
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	4,485
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	$ 4,485
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