Retirement Benefits (Details 3)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
U.S. Pension Benefit Plans [Member]
Net periodic benefit cost assumptions
Discount rate	4.55%	4.50%	5.05%
Expected return on plan assets	7.50%	7.50%	7.50%
Compensation increase rate	3.75%	3.75%	3.75%
Net benefit obligation assumptions
Discount rate	3.75%	4.55%
Compensation increase rate	3.50%	3.75%
Non-U.S. Pension Benefit Plans [Member]
Net periodic benefit cost assumptions
Discount rate	2.67%	3.01%	3.69%
Expected return on plan assets	5.21%	5.31%	5.33%
Compensation increase rate	3.11%	3.16%	3.11%
Net benefit obligation assumptions
Discount rate	1.77%	2.67%
Compensation increase rate	2.86%	3.11%
U.S. Other Postretirement Benefit Plans [Member]
Net periodic benefit cost assumptions
Discount rate	3.85%	3.65%	4.60%
Net benefit obligation assumptions
Discount rate	3.10%	3.85%
Health care cost trend rate	6.50%	7.00%
Non-U.S. Other Postretirement Benefit Plans [Member]
Net periodic benefit cost assumptions
Discount rate	3.60%	3.50%	4.20%
Net benefit obligation assumptions
Discount rate	2.80%	3.60%
Health care cost trend rate	4.95%	5.39%