Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Pension Plans, Defined Benefit [Member]
Service cost	$ 4,425	$ 4,431	$ 2,125
Interest cost	7,930	7,151	5,139
Expected return on plan assets	(9,234)	(7,120)	(4,805)
Amortization of: Transition obligation	0	86	81
Amortization of: Net (gains) losses	1,212	1,336	472
Amortization of: Net prior service (benefit) cost	66	(268)	(266)
Settlement costs	0	345	0
Curtailment costs	0	165	237
Net periodic (beneift) cost	4,399	6,126	2,983
United States Pension Plans of US Entity, Defined Benefit [Member]
Service cost	3,433	3,647	1,409
Interest cost	5,646	4,890	2,964
Expected return on plan assets	(6,693)	(4,759)	(2,627)
Amortization of: Transition obligation	0	0	0
Amortization of: Net (gains) losses	312	583	337
Amortization of: Net prior service (benefit) cost	75	(260)	(259)
Settlement costs	0	0	0
Curtailment costs	0	165	0
Net periodic (beneift) cost	2,773	4,266	1,824
Foreign Pension Plans, Defined Benefit [Member]
Service cost	992	784	716
Interest cost	2,284	2,261	2,175
Expected return on plan assets	(2,541)	(2,361)	(2,178)
Amortization of: Transition obligation	0	86	81
Amortization of: Net (gains) losses	900	753	135
Amortization of: Net prior service (benefit) cost	(9)	(8)	(7)
Settlement costs	0	345	0
Curtailment costs	0	0	237
Net periodic (beneift) cost	1,626	1,860	1,159
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	92	120	169
Interest cost	1,974	2,081	2,330
Amortization of: Net (gains) losses	128	189	97
Amortization of: Net prior service (benefit) cost	(871)	(1,249)	(3,232)
Net periodic (beneift) cost	$ 1,323	$ 1,141	$ (636)