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Warranty Accrual (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Warranty claim activity
Beginning accrued warranty balance	$ 1,000	$ 1,300	$ 1,000	$ 1,400
Provision	17	(175)	233	24
Costs incurred	(117)	(125)	(333)	(424)
Ending accrued warranty balance	$ 900	$ 1,000	$ 900	$ 1,000

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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