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, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ (8,533)	$ 4,065	$ 4,480	$ 10,610
Amount of gain (loss) reclassified from OCI (effective portion)	5,542	(1,738)	10,848	(5,593)
Foreign Exchange Contracts | Revenues
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	662	(1,604)	(1,964)	7,000
Amount of gain (loss) reclassified from OCI (effective portion)	(169)	(428)	1,498	(2,181)
Foreign Exchange Contracts | Operating expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(9,195)	5,669	6,444	3,610
Amount of gain (loss) reclassified from OCI (effective portion)	$ 5,711	$ (1,310)	$ 9,350	$ (3,412)