Summary of Significant Accounting Policies - Product Warranty Roll-forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning balance	$ 2,287	$ 1,338	$ 2,073
Warranty costs incurred	(2,570)	(1,294)	(2,246)
Additions charged to income	3,198	2,243	1,511
Balance, ending balance	$ 2,915	$ 2,287	$ 1,338