Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 202,060	$ 291,107	$ 266,709
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	154,481	221,263	201,555
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47,579	69,844	$ 65,154
Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	154,481	221,263
Level 1 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	467	324
Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47,112	69,520
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,732	3,832
Cash and Cash Equivalents | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,265	3,508
Cash and Cash Equivalents | Level 1 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	467	324
Debt Security, Corporate, US
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106,653	149,727
Debt Security, Corporate, US | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106,653	149,727
Domestic Equity Large Cap Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,088	41,988
Domestic Equity Large Cap Fund | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,088	41,988
International Equity Large Cap Growth Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,475	26,040
International Equity Large Cap Growth Fund | Level 1 [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,475	26,040
Private Equity Funds Foreign Japan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,775	2,610
Private Equity Funds Foreign Japan | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,775	2,610
Private Equity Funds Pooled Funds Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,610	2,180
Private Equity Funds Pooled Funds Foreign | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,610	2,180
Fixed Income Funds Japan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,875	5,224
Fixed Income Funds Japan | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,875	5,224
Fixed Income Funds Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,325	1,775
Fixed Income Funds Foreign | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,325	1,775
Global Target Return Equity Bond Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,533	15,201
Global Target Return Equity Bond Fund | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,533	15,201
United Kingdom Index Linked Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,253	3,236
United Kingdom Index Linked Equity Fund | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,253	3,236
Index linked international equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,271	6,093
Index linked international equity fund | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,271	6,093
Corporate Debt Securities United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,124	18,438
Corporate Debt Securities United Kingdom | Level 2 [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,124	18,438
Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,701	6,047
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	3,701	6,047
Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,645	8,716
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	$ 4,645	$ 8,716