Derivative Instruments And Hedging Activities (Schedule Of Net Gains (Losses) Related To The Effective Portion Of Foreign Currency Derivatives) (Details) (Foreign Exchange Contract, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jan. 31, 2015	Jan. 25, 2014
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	$ (683)	$ 33
Cost of revenues
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	(136)	72
Research and development
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	(35)	(300)
Sales and marketing
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	(454)	239
General and administrative
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	$ (58)	$ 22