Financial Assets and Liabilities - Unaudited Condensed Consolidated Statement of Operations Location and Amount of Gains and Losses on Derivative Instrument Fair Values for Designated Hedge Instruments, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ 1,651	$ 5,467
Amount of gain (loss) reclassified from OCI (effective portion)	(522)	(4,475)
Foreign Exchange Contracts | Revenues
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	1,080	(1,208)
Amount of gain (loss) reclassified from OCI (effective portion)	(89)	164
Foreign Exchange Contracts | Operating expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	571	6,675
Amount of gain (loss) reclassified from OCI (effective portion)	$ (433)	$ (4,639)