Balance Sheet Information and Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets	$ 1,200	$ 0	$ 0
Depreciation, amortization and impairment expense	13,300	8,631	9,109
Equity method investment in privately-held company	$ 1,600	$ 1,300
Percentage of ownership interest	24.00%	24.00%
Proportionate share of investee's losses, equity method	$ 400
Cost method investment in privately-held company	1,600	$ 600
Property and equipment
Property, Plant and Equipment [Line Items]
Depreciation, amortization and impairment expense	$ 7,700	$ 5,200	$ 3,800