Defined Benefit Pension and Other Postretirement Benefit Plans (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) plan	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Pension
Defined Benefit Plan Disclosure
Contribution by employer			$ 500
Net periodic benefit (income) costs
Net service cost	$ 347	$ 404		$ 693	$ 1,121
Interest cost	358	338		717	675
Expected return on net assets	(94)	(105)		(188)	(210)
Amortization:
Defined Benefit Plan, Actuarial Gain (Loss)	115	197		230	394
Prior service cost	21	15		42	29
Total net periodic benefit (income) costs	747	849		1,494	2,009
Pension | Maximum
Defined Benefit Plan Disclosure
Estimated employer contribution in current fiscal year			$ 1,700
Pension | Europe
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			6
Pension | Singapore
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			1
Pension | Mexico
Defined Benefit Plan Disclosure
Defined Benefit Plan, Number of Plans | plan			2
Post-retirement Benefit Plan
Net periodic benefit (income) costs
Net service cost	0	0		0	0
Interest cost	4	6		8	12
Expected return on net assets	0	0		0	0
Amortization:
Defined Benefit Plan, Actuarial Gain (Loss)	(43)	(39)		(85)	(79)
Prior service cost	0	0		0	0
Total net periodic benefit (income) costs	$ (39)	$ (33)		$ (77)	$ (67)