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, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ 3,140	$ (1,330)	$ (9,618)	$ (14,159)
Amount of gain (loss) reclassified from OCI (effective portion)	(5,197)	(6,371)	(8,913)	(7,427)
Foreign Exchange Contracts | Revenues
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(6,182)	374	(7,673)	3,340
Amount of gain (loss) reclassified from OCI (effective portion)	(1,429)	26	(1,217)	2,406
Foreign Exchange Contracts | Operating expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	9,322	(1,704)	(1,945)	(17,499)
Amount of gain (loss) reclassified from OCI (effective portion)	$ (3,768)	$ (6,397)	$ (7,696)	$ (9,833)