Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,170	$ 1,120	$ 3,499	$ 3,368
Interest cost	1,585	1,711	4,739	5,146
Expected return on plan assets	(4,168)	(3,777)	(12,467)	(11,490)
Amortization of: Net actuarial loss	373	615	1,105	1,851
Amortization of: Prior service cost	248	239	745	719
Net periodic retirement pension (benefit) cost	(792)	(92)	(2,379)	(406)
Contributions paid	490	335	1,708	2,067
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1	2
Interest cost	150	195	449	586
Amortization of: Net actuarial loss	7	12	22	35
Amortization of: Prior service cost		1	1	2
Net periodic retirement pension (benefit) cost	157	209	473	625
Contributions paid - other postretirement plans	632	851	1,610	1,372
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	433	414	1,297	1,244
Interest cost	1,240	1,398	3,718	4,193
Expected return on plan assets	(3,536)	(3,087)	(10,608)	(9,260)
Amortization of: Net actuarial loss	136	358	406	1,073
Amortization of: Prior service cost	242	234	727	702
Net periodic retirement pension (benefit) cost	(1,485)	(683)	(4,460)	(2,048)
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	737	706	2,202	2,124
Interest cost	345	313	1,021	953
Expected return on plan assets	(632)	(690)	(1,859)	(2,230)
Amortization of: Net actuarial loss	237	257	699	778
Amortization of: Prior service cost	6	5	18	17
Net periodic retirement pension (benefit) cost	693	591	2,081	1,642
Contributions paid	$ 490	$ 335	$ 1,708	$ 2,067