Employee Benefits Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,434	$ 1,856	$ 1,839
Interest cost	3,640	3,969	3,956
Expected return on plan assets	(3,070)	(3,131)	(3,078)
Amortization of actuarial losses	1,809	1,440	1,808
Amortization of prior service cost	136	192	195
Curtailment loss	1,062	0	0
Special termination benefits	0	0	0
Effects of settlement	0	35	1,049
Net periodic pension cost	5,011	4,361	5,769
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	271	173	282
Interest cost	2,146	2,711	2,820
Expected return on plan assets	(3,110)	(3,477)	(3,112)
Amortization of actuarial losses	1,388	740	1,262
Amortization of prior service cost	1	1	5
Curtailment loss	0	0	70
Special termination benefits	0	72	1,226
Effects of settlement	0	(13)	0
Net periodic pension cost	$ 696	$ 207	$ 2,553