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Financial Assets and Liabilities - Summary of Cash Cash Equivalents and Investments (Detail) - USD ($)
$ in Thousands
Oct. 31, 2015
Oct. 31, 2014
Cash, Cash Equivalents and Investments [Line Items]    
Non-marketable equity securities $ 10,300 $ 10,900
Cash Equivalents [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 239,473 409,064
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less than 12 Months (1) 0
Gross Unrealized Losses 12 Months or Longer 0 0
Estimated Fair Value 239,472 [1] 409,064 [2]
Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 128,774  
Gross Unrealized Gains 33  
Gross Unrealized Losses Less than 12 Months (60)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 128,747  
Other Long-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Non-marketable equity securities, Cost 10,277 10,869
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less Than 12Months 0 0
Gross Unrealized Loss Position 12Months Or Longer 0 0
Non-marketable equity securities 10,277 [1] 10,869 [2]
Money Market Funds (U.S.) | Cash Equivalents [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 233,839 409,064
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less than 12 Months 0 0
Gross Unrealized Losses 12 Months or Longer 0 0
Estimated Fair Value 233,839 [1] 409,064 [2]
Commercial Paper [Member] | Cash Equivalents [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 1,834  
Gross Unrealized Gains 0  
Gross Unrealized Losses Less than 12 Months 0  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 1,834  
Commercial Paper [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 12,129  
Gross Unrealized Gains 0  
Gross Unrealized Losses Less than 12 Months 0  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 12,129  
US Government Agency Securities [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 12,615  
Gross Unrealized Gains 3  
Gross Unrealized Losses Less than 12 Months (4)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 12,614  
Municipal Bonds [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 1,403  
Gross Unrealized Gains 1  
Gross Unrealized Losses Less than 12 Months (1)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 1,403  
Certificates of Deposit [Member] | Cash Equivalents [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 3,500  
Gross Unrealized Gains 0  
Gross Unrealized Losses Less than 12 Months 0  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 3,500  
Certificates of Deposit [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 9,800  
Gross Unrealized Gains 0  
Gross Unrealized Losses Less than 12 Months 0  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 9,800  
Corporate Debt Securities [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 67,201  
Gross Unrealized Gains 27  
Gross Unrealized Losses Less than 12 Months (40)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 67,188  
Asset-backed Securities [Member] | Cash Equivalents [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 300  
Gross Unrealized Gains 0  
Gross Unrealized Losses Less than 12 Months (1)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 299  
Asset-backed Securities [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 24,619  
Gross Unrealized Gains 2  
Gross Unrealized Losses Less than 12 Months (13)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 24,608  
Non-U.S. Government Agency Securities [Member] | Short-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Available-for-sale Securities, Cost 1,007  
Gross Unrealized Gains 0  
Gross Unrealized Losses Less than 12 Months (2)  
Gross Unrealized Losses 12 Months or Longer 0  
Estimated Fair Value [1] 1,005  
Non-Marketable Equity Securities [Member] | Other Long-term Investments [Member]    
Cash, Cash Equivalents and Investments [Line Items]    
Non-marketable equity securities, Cost 10,277 10,869
Gross Unrealized Gains 0 0
Gross Unrealized Losses Less Than 12Months 0 0
Gross Unrealized Loss Position 12Months Or Longer 0 0
Non-marketable equity securities $ 10,277 [1] $ 10,869 [2]
[1] See Note 6. Fair Value Measures for further discussion on fair values of cash equivalents and investments.
[2] See Note 6. Fair Value Measures for further discussion on fair values of money market funds and non-marketable equity securities