Summary of Significant Accounting Policies - Product Warranty Roll-forward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning balance	$ 1,670	$ 2,486	$ 2,797
Warranty costs incurred	(2,026)	(2,394)	(2,821)
Additions charged to income	2,429	1,578	2,510
Balance, ending balance	$ 2,073	$ 1,670	$ 2,486