Retirement Benefits (Schedule of Assumptions Used) (Details)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Pension Plan [Member] | United States [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	5.05%	6.20%	5.70%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate	6.20%	5.70%	3.05%
Long-term rate of return on plan assets	6.03%	5.53%	5.00%
Defined Benefit Pension Plan [Member] | United Kingdom
Weighted-average assumptions to determine benefit obligation:
Discount rate	5.28%	5.85%	5.35%
Rate of compensation increase	3.40%	3.60%	4.00%
Weighted-average assumptions to determine periodic benefit costs:
Long-term rate of return on plan assets	4.90%	4.80%	3.80%
Discount rate - service cost	5.91%	4.99%	2.15%
Discount rate - interest cost	5.84%	5.71%	1.83%
Rate of compensation increase	3.60%	4.00%	4.00%
Defined Benefit Pension Plan [Member] | Japan
Weighted-average assumptions to determine benefit obligation:
Discount rate	1.92%	2.01%	1.60%
Rate of compensation increase	3.00%	2.00%	2.00%
Weighted-average assumptions to determine periodic benefit costs:
Long-term rate of return on plan assets	3.25%	2.75%	2.00%
Discount rate - service cost	2.20%	1.78%	1.13%
Discount rate - interest cost	1.58%	1.17%	0.65%
Rate of compensation increase	2.00%	2.00%	2.25%
Defined Benefit Pension Plan [Member] | Germany [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	3.58%	4.27%	3.97%
Rate of compensation increase	2.50%	2.50%	2.50%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate - service cost	4.23%	3.95%	1.54%
Discount rate - interest cost	4.29%	3.91%	1.06%
Rate of compensation increase	2.50%	2.50%	2.50%
Other Postretirement Benefit Plans [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	5.00%	6.25%	5.70%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate	6.25%	5.70%	2.80%