Defined Benefit Pension and Other Postretirement Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Europe
Defined Benefit Plan Disclosure
Number of defined benefit pension plans			6
Singapore
Defined Benefit Plan Disclosure
Number of defined benefit pension plans			1
Mexico
Defined Benefit Plan Disclosure
Number of defined benefit pension plans			2
Pension
Net periodic benefit (income) costs
Net service cost	$ 338,000	$ 332,000	$ 676,000	$ 663,000
Interest cost	478,000	428,000	957,000	856,000
Expected return on net assets	(124,000)	(110,000)	(247,000)	(219,000)
Amortization:
Actuarial (gain) loss	76,000	79,000	132,000	157,000
Prior service cost	5,000	1,000	9,000	2,000
Total net periodic benefit (income) costs	773,000	730,000	1,527,000	1,459,000
Contribution by employer			500,000
Pension | Maximum
Amortization:
Estimated employer contribution in current fiscal year			1,600,000
Post-retirement Benefit Plan
Net periodic benefit (income) costs
Interest cost	6,000	7,000	12,000	12,000
Amortization:
Actuarial (gain) loss	(52,000)	(61,000)	(104,000)	(131,000)
Total net periodic benefit (income) costs	$ (46,000)	$ (54,000)	$ (92,000)	$ (119,000)