Gains And Losses On Derivative Instrument Recognized In Statement Of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ (10,095)	$ (3,715)	$ (9,996)	$ 5,091
Amount of gain (loss) reclassified from OCI (effective portion)	(3,890)	1,732	(9,461)	(2,910)
Foreign Exchange Contracts | Revenue
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(359)	(4,365)	4,635	(2,562)
Amount of gain (loss) reclassified from OCI (effective portion)	(55)	(1,389)	(1,689)	(6,284)
Foreign Exchange Contracts | Operating Expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(9,736)	650	(14,631)	7,653
Amount of gain (loss) reclassified from OCI (effective portion)	$ (3,835)	$ 3,121	$ (7,772)	$ 3,374