Net Income Per Share (Schedule Of Calculation Of Basic And Diluted Net Income (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended											12 Months Ended
		Oct. 31, 2015		Aug. 01, 2015	May. 02, 2015	[1]	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May. 03, 2014	[1]	Jan. 25, 2014	Oct. 31, 2015		Nov. 01, 2014	Oct. 26, 2013	Jan. 14, 2015
Basic net income per share
Net income													$ 340,362		$ 237,971	$ 208,623
Weighted-average shares used in computing basic net income per share		414,769		417,299	420,718		428,536	431,843	432,448	436,167		440,573	420,331		435,258	450,516
Net income per share—basic		$ 0.20		$ 0.22	$ 0.18		$ 0.20	$ 0.19	$ 0.20	$ (0.03)		$ 0.18	$ 0.81		$ 0.55	$ 0.46
Diluted net income per share
Net income													$ 340,362		$ 237,971	$ 208,623
Weighted-average shares used in computing diluted net income per share		422,315		427,518	433,234		439,156	441,649	441,789	436,167		453,549	430,556		446,859	463,705
Net income per share—diluted		$ 0.20		$ 0.21	$ 0.18		$ 0.20	$ 0.19	$ 0.20	$ (0.03)		$ 0.18	$ 0.79		$ 0.53	$ 0.45
Weighted Average Number of Shares Outstanding Reconciliation
Weighted-average shares used in computing basic net income per share		414,769		417,299	420,718		428,536	431,843	432,448	436,167		440,573	420,331		435,258	450,516
Dilutive potential common shares in the form of stock options													1,722		1,995	3,472
Dilutive potential common shares in the form of other share-based awards													8,503		9,606	9,717
Weighted-average shares used in computing diluted net income per share		422,315		427,518	433,234		439,156	441,649	441,789	436,167		453,549	430,556		446,859	463,705
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	[2],[3]														0	0
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	[3]												977		1,725	11,868
Other share based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	[3]												142		893	167
Convertible Senior Unsecured 2020 Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Debt Instrument, Convertible, Conversion Price		$ 15.90	[2],[3]										$ 15.90	[2],[3]			$ 15.93
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 20.61											$ 20.61				$ 20.65
Convertible Senior Unsecured 2020 Notes [Member] | Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	[2],[3]												28,880

[1] The quarter ended May 3, 2014, includes the impact of an $83.4 million impairment of goodwill in the Company’s Application Delivery Products reporting unit.

[2] In connection with the issuance of the 2020 Convertible Notes, the Company entered into convertible note hedge and warrant transactions as described in Note 8, “Borrowings.” The 2020 Convertible Notes have no impact on diluted earnings per share until the average quarterly price of the Company’s common stock exceeds the adjusted conversion price of $15.90 per share. If the common stock price exceeds this adjusted conversion price, prior to conversion, the Company will calculate the effect of the additional shares that may be issued using the treasury stock method. If the average price of the Company’s common stock exceeds $20.61 per share for a quarterly period, the Company’s weighted-average shares used in computing diluted net income per share will be impacted by the effect of the additional potential shares that may be issued related to the warrants using the treasury stock method. The convertible note hedge is not considered for purposes of the diluted earnings per share calculation, as its effect would be antidilutive.

[3] These amounts are excluded from the computation of diluted net income per share.