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Summary of Significant Accounting Policies - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Oct. 31, 2016
Oct. 31, 2015
Accounts payable and accrued liabilities Current    
Payroll and related benefits $ 321,430 $ 315,078
Other accrued liabilities 66,276 60,545
Accounts payable 13,745 9,919
Total $ 401,451 $ 385,542