Accounting Principles and Practices (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 791	$ 1,070
Accrual for warranties issued	1,573	2,267
Warranties settled	(1,605)	(2,546)
Balance at end of year	$ 759	$ 791