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, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ (1,330)	$ 3,066	$ (14,159)	$ 2,472
Amount of gain (loss) reclassified from OCI (effective portion)	(6,371)	(874)	(7,427)	2,432
Foreign Exchange Contracts | Revenues
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	374	176	3,340	3,364
Amount of gain (loss) reclassified from OCI (effective portion)	26	(1,083)	2,406	1,674
Foreign Exchange Contracts | Operating Expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(1,704)	2,890	(17,499)	(892)
Amount of gain (loss) reclassified from OCI (effective portion)	$ (6,397)	$ 209	$ (9,833)	$ 758