Benefit Plans Level 4 (Details) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 51	$ 47
Defined Benefit Plan, Interest Cost	609	654
Defined Benefit Plan, Expected Return on Plan Assets	(821)	(758)
Defined Benefit Plan, Amortization of Gains (Losses)	267	267
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	106	210
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	127	117
Defined Benefit Plan, Interest Cost	74	75
Defined Benefit Plan, Expected Return on Plan Assets	(75)	(82)
Defined Benefit Plan, Amortization of Gains (Losses)	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	126	110
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0
Defined Benefit Plan, Interest Cost	248	292
Defined Benefit Plan, Expected Return on Plan Assets	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	106	97
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(816)	(816)
Defined Benefit Plan, Net Periodic Benefit Cost	$ (462)	$ (427)