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Acquisitions - Schedule of Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Feb. 29, 2016
Oct. 31, 2015
Feb. 28, 2015
Business Acquisition [Line Items]      
Goodwill $ 69,595   $ 39,742
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