Summary of Significant Accounting Policies - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Accounts payable and accrued liabilities Current
Payroll and related benefits	$ 382,773	$ 321,430
Other accrued liabilities	97,119	66,276
Accounts payable	19,954	13,745
Total	$ 499,846	$ 401,451