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Commitments and Contingencies (Product Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Commitments And Contingencies Product Warranties Details      
Balance at beginning of year $ 339 $ 660 $ 452
Accruals for warranties 355 185 953
Settlements (303) (364) (745)
Changes in estimate (65) (142) 0
Balance at end of year $ 326 $ 339 $ 660