Financial Assets and Liabilities (Gains and Losses on Derivative Instrument Recognized in Statement of Operations) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ (3,715)	$ (7,057)	$ 5,091	$ (12,348)
Amount of gain (loss) reclassified from OCI (effective portion)	1,732	467	(2,910)	4,216
Foreign Exchange Contracts [Member] | Revenue [Member]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	(4,365)	(3,644)	(2,562)	(2,565)
Amount of gain (loss) reclassified from OCI (effective portion)	(1,389)	703	(6,284)	1,601
Foreign Exchange Contracts [Member] | Operating Expenses [Member]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	650	(3,413)	7,653	(9,783)
Amount of gain (loss) reclassified from OCI (effective portion)	$ 3,121	$ (236)	$ 3,374	$ 2,615