Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 73,989	$ 73,989
Finite-Lived Intangible Assets, Accumulated Amortization	(58,365)	(53,601)
Finite-Lived Intangible Assets, Net	15,624	20,388
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,530	1,530
Finite-Lived Intangible Assets, Accumulated Amortization	(1,530)	(1,530)
Finite-Lived Intangible Assets, Net	0	0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	24,867	24,867
Finite-Lived Intangible Assets, Accumulated Amortization	(13,547)	(10,926)
Finite-Lived Intangible Assets, Net	11,320	13,941
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	45,234	45,234
Finite-Lived Intangible Assets, Accumulated Amortization	(41,431)	(39,455)
Finite-Lived Intangible Assets, Net	3,803	5,779
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	510	510
Finite-Lived Intangible Assets, Accumulated Amortization	(510)	(510)
Finite-Lived Intangible Assets, Net	0	0
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,848	1,848
Finite-Lived Intangible Assets, Accumulated Amortization	(1,347)	(1,180)
Finite-Lived Intangible Assets, Net	$ 501	$ 668