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Warranty (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Warranty claim activity
Beginning accrued warranty balance	$ 1,400	$ 2,150	$ 1,400	$ 2,300
Provision	88	276	199	348
Costs incurred	(188)	(626)	(299)	(848)
Ending accrued warranty balance	$ 1,300	$ 1,800	$ 1,300	$ 1,800

- 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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