Goodwill and Intangible Assets - Schedule of Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 74,302	$ 39,770
Accumulated Amortization	(35,110)	(30,849)
Net Carrying Value	39,192	8,921
Acquired developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	50,082	28,799
Accumulated Amortization	(25,643)	(22,987)
Net Carrying Value	24,439	5,812
Software license
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	400	400
Accumulated Amortization	(400)	(400)
Net Carrying Value	0	0
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,809	8,233
Accumulated Amortization	(7,313)	(6,032)
Net Carrying Value	12,496	2,201
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,999	1,625
Accumulated Amortization	(1,295)	(1,058)
Net Carrying Value	1,704	567
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	812	513
Accumulated Amortization	(259)	(172)
Net Carrying Value	553	341
Acquired developed software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	200	200
Accumulated Amortization	(200)	(200)
Net Carrying Value	$ 0	$ 0