Income Taxes 1 of 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Expected tax at 35%	$ 4,560	$ 11,068	$ 12,605
Expected tax rate (percentage)	35.00%	35.00%		35.00%
State income taxes net of federal benefit	$ 893	$ 717	721
Foreign taxes less than statutory federal rate	(1,921)	(2,370)	(2,471)
Permanent items	2,521	1,187	(264)
Valuation allowance	(829)	2,860	(18)
(Utilization)/Expiration of foreign tax credits	0	(945)	0
Research and development credits	(643)	(200)	(1,641)
Other	(538)	(272)	(107)
Income tax expense	4,043	12,045	8,825
Current income tax expense (benefit):
United States Federal	41	1,905	2,853
State taxes	217	441	257
Foreign	3,296	2,363	3,641
Deferred income tax expense (benefit):
United States	5,797	7,235	5,098
Foreign	(5,308)	101	(3,024)
Income tax expense	$ 4,043	$ 12,045	$ 8,825