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		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ (10,085)	$ 447	$ (8,434)	$ 5,914
Amount of gain (loss) reclassified from OCI (effective portion)	(331)	(4,012)	(854)	(8,487)
Foreign Exchange Contracts | Revenues
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	1,130	1,949	2,210	741
Amount of gain (loss) reclassified from OCI (effective portion)	272	199	182	363
Foreign Exchange Contracts | Operating expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(11,215)	(1,502)	(10,644)	5,173
Amount of gain (loss) reclassified from OCI (effective portion)	$ (603)	$ (4,211)	$ (1,036)	$ (8,850)