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Fair Value Measures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Oct. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets $ 587,533 $ 691,528
Total liabilities 3,343 5,731
Money Market Funds (U.S.)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 439,248 552,470
Foreign Currency Derivative Contracts
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Prepaid and other current assets 6,352 12,437
Accounts payable and accrued liabilities 3,343 5,238
Deferred Compensation Plan Assets
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other long-term assets 141,933 126,621
Contingent Consideration
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts payable and accrued liabilities   493
Quoted Prices In Active Markets For Identical Assets (Level 1)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 581,181 679,091
Total liabilities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Money Market Funds (U.S.)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 439,248 552,470
Quoted Prices In Active Markets For Identical Assets (Level 1) | Foreign Currency Derivative Contracts
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Prepaid and other current assets 0 0
Accounts payable and accrued liabilities 0 0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Deferred Compensation Plan Assets
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other long-term assets 141,933 126,621
Quoted Prices In Active Markets For Identical Assets (Level 1) | Contingent Consideration
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts payable and accrued liabilities   0
Significant Other Observable Inputs (Level 2)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 6,352 12,437
Total liabilities 3,343 5,238
Significant Other Observable Inputs (Level 2) | Money Market Funds (U.S.)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Foreign Currency Derivative Contracts
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Prepaid and other current assets 6,352 12,437
Accounts payable and accrued liabilities 3,343 5,238
Significant Other Observable Inputs (Level 2) | Deferred Compensation Plan Assets
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other long-term assets 0 0
Significant Other Observable Inputs (Level 2) | Contingent Consideration
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts payable and accrued liabilities   0
Significant Unobservable Inputs (Level 3)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 0 0
Total liabilities 0 493
Significant Unobservable Inputs (Level 3) | Money Market Funds (U.S.)
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Significant Unobservable Inputs (Level 3) | Foreign Currency Derivative Contracts
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Prepaid and other current assets 0 0
Accounts payable and accrued liabilities 0 0
Significant Unobservable Inputs (Level 3) | Deferred Compensation Plan Assets
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other long-term assets 0 0
Significant Unobservable Inputs (Level 3) | Contingent Consideration
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts payable and accrued liabilities   $ 493