Liabilities and Restructuring Charges - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Oct. 31, 2017
Payables and Accruals [Abstract]
Payroll and related benefits	$ 338,014	$ 382,773
Other accrued liabilities	61,550	97,119
Accounts payable	49,473	19,954
Total	$ 449,037	$ 499,846