Employee Benefits Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,856	$ 1,839	$ 1,777
Interest cost	3,969	3,956	4,289
Expected return on plan assets	(3,131)	(3,078)	(3,313)
Amortization of actuarial losses	1,440	1,808	1,509
Amortization of prior service cost	192	195	204
Curtailment gain	0	0	0
Special termination benefits	0	0	0
Effects of settlement	35	1,049	0
Net periodic pension cost	4,361	5,769	4,466
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	173	282	288
Interest cost	2,711	2,820	3,046
Expected return on plan assets	(3,477)	(3,112)	(2,945)
Amortization of actuarial losses	740	1,262	479
Amortization of prior service cost	1	5	16
Curtailment gain	0	70	(27)
Special termination benefits	72	1,226	45
Effects of settlement	(13)	0	0
Net periodic pension cost	$ 207	$ 2,553	$ 902