Retirement Benefits (Schedule of Assumptions Used) (Details)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Pension Plan [Member] | United States [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	6.20%	5.70%	3.05%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate	5.70%	3.05%	2.75%
Long-term rate of return on plan assets	5.53%	5.00%	7.15%
Defined Benefit Pension Plan [Member] | United Kingdom
Weighted-average assumptions to determine benefit obligation:
Discount rate	5.85%	5.35%	2.05%
Rate of compensation increase	3.60%	4.00%	3.80%
Weighted-average assumptions to determine periodic benefit costs:
Long-term rate of return on plan assets	4.80%	3.80%	4.00%
Discount rate - service cost	4.99%	2.15%	1.71%
Discount rate - interest cost	5.71%	1.83%	1.41%
Rate of compensation increase	4.00%	4.00%	3.30%
Defined Benefit Pension Plan [Member] | Japan
Weighted-average assumptions to determine benefit obligation:
Discount rate	2.01%	1.60%	0.92%
Rate of compensation increase	2.00%	2.00%	2.00%
Weighted-average assumptions to determine periodic benefit costs:
Long-term rate of return on plan assets	2.75%	2.00%	2.00%
Discount rate - service cost	1.78%	1.13%	1.33%
Discount rate - interest cost	1.17%	0.65%	0.74%
Rate of compensation increase	2.00%	2.25%	2.00%
Defined Benefit Pension Plan [Member] | Germany [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	4.27%	3.97%	1.36%
Rate of compensation increase	2.50%	2.50%	2.50%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate - service cost	3.95%	1.54%	1.11%
Discount rate - interest cost	3.91%	1.06%	0.76%
Rate of compensation increase	2.50%	2.50%	2.50%
Other Postretirement Benefit Plans [Member]
Weighted-average assumptions to determine benefit obligation:
Discount rate	6.25%	5.70%	2.80%
Weighted-average assumptions to determine periodic benefit costs:
Discount rate	5.70%	2.80%	2.45%