Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Allowance for Doubtful Accounts
SCHEDULE II VALUATION and QUALIFYING ACCOUNTS
Balance at beginning of period	$ 505	$ 458	$ 384
Provisions charged to expense	132	575	285
Write offs and other	493	528	211
Balance at end of period	144	505	458
Inventory Obsolescence Reserve
SCHEDULE II VALUATION and QUALIFYING ACCOUNTS
Balance at beginning of period	2,127	1,619	2,527
Provisions charged to expense	2,212	509	10,505
Write offs and other	866	1	11,413
Balance at end of period	$ 3,473	$ 2,127	$ 1,619