Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,893	$ 4,651	$ 4,524
Interest cost	$ 6,893	$ 6,318	$ 6,868
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Expected return on plan assets	$ (13,287)	$ (16,626)	$ (15,173)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Amortization of: Net losses	$ 814	$ 1,472	$ 2,476
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Amortization of: Prior service cost (benefit)	$ 1,004	$ 994	$ 959
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Net periodic (benefit) cost	$ (683)	$ (3,191)	$ (346)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2
Interest cost	577	599	782
Amortization of: Net losses	(94)	30	47
Amortization of: Prior service cost (benefit)		1	3
Net periodic (benefit) cost	484	631	834
United States [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,554	1,729	1,659
Interest cost	$ 5,281	$ 4,957	$ 5,590
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Expected return on plan assets	$ (10,853)	$ (14,144)	$ (12,346)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Amortization of: Net losses	$ 259	$ 541	$ 1,430
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Amortization of: Prior service cost (benefit)	$ 981	$ 969	$ 936
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Net periodic (benefit) cost	$ (2,778)	$ (5,948)	$ (2,731)
Foreign Plan | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,339	2,922	2,865
Interest cost	$ 1,612	$ 1,361	$ 1,278
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Expected return on plan assets	$ (2,434)	$ (2,482)	$ (2,827)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Amortization of: Net losses	$ 555	$ 931	$ 1,046
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Amortization of: Prior service cost (benefit)	$ 23	$ 25	$ 23
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income Expense	Other Nonoperating Income Expense	Other Nonoperating Income Expense
Net periodic (benefit) cost	$ 2,095	$ 2,757	$ 2,385