Employee Benefits Pension Obligations for all Defined Benefit Pension Plans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 104,686	$ 96,233
Accumulated benefit obligation	102,455	93,798
Fair value of plan assets	45,087	45,256
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	61,565	49,562
Accumulated benefit obligation	59,759	45,841
Fair value of plan assets	$ 42,831	$ 21,891