Summary of Significant Accounting Policies - Product Warranty Roll-forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning balance	$ 2,915	$ 2,287	$ 1,338
Warranty costs incurred	(1,947)	(2,570)	(1,294)
Additions charged to income	1,130	3,198	2,243
Balance, ending balance	$ 2,098	$ 2,915	$ 2,287