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, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ 447	$ (8,533)	$ 5,914	$ 4,480
Amount of gain (loss) reclassified from OCI (effective portion)	(4,012)	5,542	(8,487)	10,848
Foreign Exchange Contracts | Revenues
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	1,949	662	741	(1,964)
Amount of gain (loss) reclassified from OCI (effective portion)	199	(169)	363	1,498
Foreign Exchange Contracts | Operating expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(1,502)	(9,195)	5,173	6,444
Amount of gain (loss) reclassified from OCI (effective portion)	$ (4,211)	$ 5,711	$ (8,850)	$ 9,350