Pension Plans (Schedule of Assumptions Used) (Details) - Pension Plan	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
International
Plan obligations:
Discount rate	2.10%	2.10%	1.70%
Compensation increase rate	2.10%	2.40%	3.20%
Net periodic benefit cost:
Discount rate	2.10%	1.70%	2.80%
Expected long-term rate of return on plan assets	3.80%	5.10%	5.20%
Compensation increase rate	2.40%	3.20%	3.30%
United States
Plan obligations:
Discount rate	4.30%	3.70%	3.40%
Compensation increase rate	0.00%	0.00%	0.00%
Net periodic benefit cost:
Discount rate	3.70%	3.40%	4.20%
Expected long-term rate of return on plan assets	6.60%	7.50%	7.80%
Compensation increase rate	0.00%	0.00%	0.00%