Defined Benefit Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Europe
Defined Benefit Plan Disclosure
Defined Benefit Plan, Other Information			6
Singapore
Defined Benefit Plan Disclosure
Defined Benefit Plan, Other Information			1
Mexico
Defined Benefit Plan Disclosure
Defined Benefit Plan, Other Information			2
Pension
Net periodic benefit (income) costs
Net service cost	$ 404	$ 338	$ 1,121	$ 676
Interest cost	338	478	675	957
Expected return on net assets	(105)	(124)	(210)	(247)
Amortization:
Actuarial (gain) loss	197	76	394	132
Prior service cost	15	5	29	9
Total net periodic benefit (income) costs	849	773	2,009	1,527
Contribution by employer			500
Pension | Maximum
Amortization:
Estimated employer contribution in current fiscal year			1,500
Post-retirement Benefit Plan
Net periodic benefit (income) costs
Interest cost	6	6	12	12
Amortization:
Actuarial (gain) loss	(39)	(52)	(79)	(104)
Total net periodic benefit (income) costs	$ (33)	$ (46)	$ (67)	$ (92)