Annual report pursuant to Section 13 and 15(d)

Inventories Inventories - Valuation Reserve Accounts (Details)

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Inventories Inventories - Valuation Reserve Accounts (Details) - Inventory Valuation Reserve [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of period $ 1,116 $ 893 $ 1,076
Reductions charged to expense 383 279 (129)
Charged to reserve (212) (56) (54)
Balance, end of period $ 1,287 $ 1,116 $ 893