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Warranty Reserves (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at February 29, 2012	$ 1,660	$ 1,848	$ 2,073
Warranty costs incurred	(595)	(595)	(657)
Additions charged to income	245	407	432
Balance at August 31, 2012	$ 1,310	$ 1,660	$ 1,848

- 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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