Benefit Plans Level 4 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation	$ 125		$ 125
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	37	51	75	103
Defined Benefit Plan, Interest Cost	523	609	1,046	1,219
Defined Benefit Plan, Expected Return on Plan Assets	(834)	(821)	(1,669)	(1,642)
Defined Benefit Plan, Amortization of Gains (Losses)	333	267	667	533
Defined Benefit Plan, Curtailments			0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	59	106	119	213
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	20	119	41	238
Defined Benefit Plan, Interest Cost	18	69	36	138
Defined Benefit Plan, Expected Return on Plan Assets	(24)	(70)	(48)	(140)
Defined Benefit Plan, Amortization of Gains (Losses)	0	0	0	0
Defined Benefit Plan, Curtailments			(125)	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	14	118	(96)	236
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0	0
Defined Benefit Plan, Interest Cost	217	248	434	496
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	181	106	362	212
Defined Benefit Plan, Curtailments			0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(816)	(816)	(1,631)	(1,631)
Defined Benefit Plan, Net Periodic Benefit Cost	$ (418)	$ (462)	$ (835)	$ (923)