Income statement 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, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ (2,152)	$ 4,783	$ 3,800	$ 99
Amount of gain (loss) reclassified from OCI (effective portion)	2,010	(2,117)	1,730	(5,570)
Foreign Exchange Contracts | Revenue
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	230	4,578	2,858	4,994
Amount of gain (loss) reclassified from OCI (effective portion)	2,067	(24)	2,554	(1,634)
Foreign Exchange Contracts | Operating Expenses
Financial Assets and Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(2,382)	205	942	(4,895)
Amount of gain (loss) reclassified from OCI (effective portion)	$ (57)	$ (2,093)	$ (824)	$ (3,936)