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, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ 3,066	$ (2,152)	$ 2,472	$ 3,800
Amount of gain (loss) reclassified from OCI (effective portion)	(874)	2,010	2,432	1,730
Foreign Exchange Contracts | Revenue
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	176	230	3,364	2,858
Amount of gain (loss) reclassified from OCI (effective portion)	(1,083)	2,067	1,674	2,554
Foreign Exchange Contracts | Operating Expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	2,890	(2,382)	(892)	942
Amount of gain (loss) reclassified from OCI (effective portion)	$ 209	$ (57)	$ 758	$ (824)