Annual report pursuant to Section 13 and 15(d)

Accrued Warranty Reserve (Details)

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Accrued Warranty Reserve (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Accrued Warranty Reserve      
Balance at the beginning of the period $ 1,494 $ 1,081 $ 1,036
Standard warranty provision 3,874 3,790 2,015
Changes for accrual related to reliability repair programs 1,255 437 74
Deductions for warranty claims (4,324) (3,814) (2,044)
Balance at the end of the period $ 2,299 $ 1,494 $ 1,081