Financial Assets And Liabilities (Gains And Losses On Derivative Instrument Recognized In Statement Of Operations And Statement Of Operations Location) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Financial Assets And Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	$ 4,783	$ 7,866	$ 99	$ 8,806
Amount of gain (loss) reclassified from OCI (effective portion)	(2,117)	(984)	(5,570)	(4,642)
Foreign Exchange Contracts [Member] | Revenue [Member]
Financial Assets And Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	4,578	361	4,994	1,803
Amount of gain (loss) reclassified from OCI (effective portion)	(24)	(1,969)	(1,634)	(4,895)
Foreign Exchange Contracts [Member] | Operating Expenses [Member]
Financial Assets And Liabilities [Line Items]
Amount of gain (loss) recognized in OCI on derivatives (effective portion)	205	7,505	(4,895)	7,003
Amount of gain (loss) reclassified from OCI (effective portion)	$ (2,093)	$ 985	$ (3,936)	$ 253