Retirement Benefits (Schedule of Net Perioodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
Service cost	$ 1,369	$ 1,167	$ 2,757	$ 2,337
Interest cost	1,917	2,023	3,857	4,046
Expected return on plan assets	(2,693)	(2,397)	(5,417)	(4,794)
Amortization of: Net actuarial (gain) loss	458	296	926	594
Amortization of: Prior service cost (benefit)	16	16	33	33
Net periodic retirement pension (beneift) cost	1,067	1,105	2,156	2,216
Contributions paid	1,943	601	5,257	2,632
United States Pension Plans of US Entity, Defined Benefit [Member]
Service cost	1,107	882	2,214	1,765
Interest cost	1,392	1,454	2,784	2,908
Expected return on plan assets	(2,045)	(1,752)	(4,090)	(3,504)
Amortization of: Net actuarial (gain) loss	343	131	687	262
Amortization of: Prior service cost (benefit)	18	18	37	37
Net periodic retirement pension (beneift) cost	815	733	1,632	1,468
Contributions paid	1,500	150	3,000	300
Foreign Pension Plans, Defined Benefit [Member]
Service cost	262	285	543	572
Interest cost	525	569	1,073	1,138
Expected return on plan assets	(648)	(645)	(1,327)	(1,290)
Amortization of: Net actuarial (gain) loss	115	165	239	332
Amortization of: Prior service cost (benefit)	(2)	(2)	(4)	(4)
Net periodic retirement pension (beneift) cost	252	372	524	748
Contributions paid	443	451	2,257	2,332
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	18	18	36	35
Interest cost	311	450	622	899
Amortization of: Net actuarial (gain) loss	(17)	23	(34)	46
Amortization of: Prior service cost (benefit)	(39)	(138)	(79)	(275)
Net periodic retirement pension (beneift) cost	273	353	545	705
Contributions paid	$ 587	$ 792	$ 1,343	$ 1,293