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Warranty Reserves (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at February 29, 2012	$ 1,518	$ 1,271	$ 1,670
Warranty costs incurred	(470)	(368)	(754)
Additions charged to income	253	615	355
Balance at August 31, 2012	$ 1,301	$ 1,518	$ 1,271

- 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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