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	3 Months Ended		6 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	Apr. 29, 2017	Apr. 30, 2016
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	$ (280)	$ (780)	$ (487)	$ (1,474)
Cost of revenues
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	(48)	(66)	(75)	(160)
Research and development
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	(33)	(427)	(68)	(626)
Sales and marketing
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	(182)	(270)	(314)	(644)
General and administrative
Derivative Instruments, Gain (Loss)
Net gains (losses) related to the effective portion of foreign currency derivatives	$ (17)	$ (17)	$ (30)	$ (44)