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Acquisitions - Schedule of Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Feb. 28, 2017
Feb. 29, 2016
Oct. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 69,795 $ 69,595  
Intronis Inc      
Business Acquisition [Line Items]      
Cash     $ 2,327
Accounts receivable     376
Other current assets     654
Property and equipment     4,203
Other non-current assets     750
Goodwill     29,718
Accounts payable     (685)
Accrued expenses     (1,149)
Deferred revenue (current)     (649)
Deferred tax liabilities     (3,930)
Total value of assets acquired and liabilities assumed     65,285
Acquired developed technology | Intronis Inc      
Business Acquisition [Line Items]      
Intangible assets     21,500
Customer relationships | Intronis Inc      
Business Acquisition [Line Items]      
Intangible assets     11,870
Trade name | Intronis Inc      
Business Acquisition [Line Items]      
Intangible assets     $ 300