Goodwill and Intangible Assets - Schedule of Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	May 31, 2016	Feb. 29, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,806	$ 73,702
Accumulated Amortization	(36,484)	(34,510)
Net Carrying Value	37,322	39,192
Acquired developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	50,133	50,082
Accumulated Amortization	(26,849)	(25,643)
Net Carrying Value	23,284	24,439
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,862	19,809
Accumulated Amortization	(7,929)	(7,313)
Net Carrying Value	11,933	12,496
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,999	2,999
Accumulated Amortization	(1,417)	(1,295)
Net Carrying Value	1,582	1,704
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	812	812
Accumulated Amortization	(289)	(259)
Net Carrying Value	$ 523	$ 553