Employee Benefits Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 4,705	$ 4,531	$ 4,062
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in 2013	5,271
2013	9,877
2014	6,934
2015	9,099
2016	7,690
2017	6,727
Years 2018-2022	37,917
Employer contributions	6,191	5,655
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in 2013	4,309
2013	4,355
2014	3,575
2015	3,756
2016	3,470
2017	3,457
Years 2018-2022	21,559
Employer contributions	5,388	6,038
U.S. Plans, Other Benfits [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	797
2014	757
2015	743
2016	722
2017	709
Years 2018-2022	3,311
Employer contributions	643	620
Non-U.S. Plans, Other Benfits [Member]
Defined Benefit Plan Disclosure [Line Items]
2013	140
2014	146
2015	150
2016	152
2017	150
Years 2018-2022	605
Employer contributions	$ 108	$ 154