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Business Combinations - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Oct. 31, 2016
Feb. 01, 2016
Aug. 03, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Goodwill $ 267,458 $ 266,974    
TeraXion Inc.        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Inventory     $ 119  
Fixed assets     1,381  
Goodwill     10,083  
Total purchase consideration     32,000  
TeraXion Inc. | Developed technology        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Intangible assets acquired     16,468  
TeraXion Inc. | In-process technology        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Intangible assets acquired     $ 3,949  
Cyan, Inc        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Cash and cash equivalents       $ 60,831
Restricted cash       10,001
Accounts receivable       23,891
Inventory       12,849
Prepaid expenses and other       3,502
Equipment, furniture and fixtures       7,962
Goodwill       256,434
Other long-term assets       789
Accounts payable       (30,856)
Accrued liabilities       (15,887)
Deferred revenue       (16,643)
Long-term debt       (48,836)
Additional paid-in capital related to equity component of long-term debt       (82,164)
Total purchase consideration       335,735
Cyan, Inc | Trademarks        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Intangible assets acquired       3,432
Cyan, Inc | Customer relationships        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Intangible assets acquired       36,323
Cyan, Inc | Developed technology        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Intangible assets acquired       88,814
Cyan, Inc | Order backlog        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Intangible assets acquired       $ 25,293