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Fair Value Measures - Non-Marketable Equity Securities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Fair Value [Line Items]      
Write-down of long-term investments $ 0us-gaap_ImpairmentOfInvestments $ 0us-gaap_ImpairmentOfInvestments $ (452)us-gaap_ImpairmentOfInvestments
Fair Value, Measurements, Nonrecurring | Other Long-Term Assets      
Fair Value [Line Items]      
Non-marketable equity securities     0us-gaap_SecurityOwnedNotReadilyMarketableFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other Long-Term Assets      
Fair Value [Line Items]      
Non-marketable equity securities     $ 0us-gaap_SecurityOwnedNotReadilyMarketableFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember