Goodwill and Other Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 881	$ 1,215	$ 1,327
Cost of Sales
Finite-Lived Intangible Assets [Line Items]
Amortization expense	158	139	132
Cost of Sales | Patents
Finite-Lived Intangible Assets [Line Items]
Amortization expense	158	139	132
Operating Expenses
Finite-Lived Intangible Assets [Line Items]
Amortization expense	723	1,076	1,195
Operating Expenses | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization expense	542	891	1,085
Operating Expenses | Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortization expense	161	156	90
Operating Expenses | Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Amortization expense	20	20	20
Operating Expenses | Patents
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 0	$ 9	$ 0