Retirement Benefits (Assumption in calculating net periodic benefit Cost) (Details)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
US [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.90%	5.10%	5.70%
Expected return on plan assets	8.80%	8.80%	8.80%
Rate of compensation increase	4.00%	4.00%	4.30%
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	4.90%	5.50%
Expected return on plan assets	6.60%	6.60%	7.30%
Rate of compensation increase	3.80%	3.80%	3.70%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.70%	2.80%	4.20%