Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,010	$ 1,161
Interest cost	1,746	1,572
Expected return on plan assets	(3,358)	(4,138)
Amortization of: Net actuarial (gain) loss	211	363
Amortization of: Prior service cost	251	248
Net periodic retirement pension (benefit) cost	(140)	(794)
Contributions paid	688	543
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	144	150
Amortization of: Net actuarial (gain) loss	(24)	7
Net periodic retirement pension (benefit) cost	120	157
Contributions paid - other postretirement plans	471	38
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	389	432
Interest cost	1,320	1,239
Expected return on plan assets	(2,713)	(3,536)
Amortization of: Net actuarial (gain) loss	65	135
Amortization of: Prior service cost	245	242
Net periodic retirement pension (benefit) cost	(694)	(1,488)
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	621	729
Interest cost	426	333
Expected return on plan assets	(645)	(602)
Amortization of: Net actuarial (gain) loss	146	228
Amortization of: Prior service cost	6	6
Net periodic retirement pension (benefit) cost	554	694
Contributions paid	$ 688	$ 543