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Net Income Per Share (Schedule Of Calculation Of Basic And Diluted Net Income (Loss) Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Oct. 26, 2013
Jul. 27, 2013
Apr. 27, 2013
Jan. 26, 2013
Oct. 27, 2012
Jul. 28, 2012
Apr. 28, 2012
Jan. 28, 2012
Oct. 26, 2013
Oct. 27, 2012
Oct. 29, 2011
Basic net income per-share                      
Net income                 $ 208,623 $ 195,181 $ 50,610
Weighted-average shares used in computing basic net income per-share 444,642 449,446 453,133 454,843 459,333 457,147 457,541 452,494 450,516 456,629 474,259
Net income per-share—basic $ 0.14 $ 0.26 [1] $ 0.10 $ (0.05) $ 0.12 $ 0.09 $ 0.09 $ 0.13 $ 0.46 $ 0.43 $ 0.11
Diluted net income per-share                      
Net income                 $ 208,623 $ 195,181 $ 50,610
Weighted-average shares used in computing diluted net income per-share 460,237 461,344 466,919 454,843 474,213 469,571 476,848 468,738 463,705 472,343 497,030
Net income per-share—diluted $ 0.14 $ 0.26 [1] $ 0.10 $ (0.05) $ 0.11 $ 0.09 $ 0.08 $ 0.12 $ 0.45 $ 0.41 $ 0.10
Weighted Average Number of Shares Outstanding Reconciliation                      
Weighted-average shares used in computing basic net income per-share 444,642 449,446 453,133 454,843 459,333 457,147 457,541 452,494 450,516 456,629 474,259
Dilutive potential common shares in the form of stock options                 3,472 7,846 13,654
Dilutive potential common shares in the form of other share-based awards                 9,717 7,868 9,117
Weighted-average shares used in computing diluted net income per-share 460,237 461,344 466,919 454,843 474,213 469,571 476,848 468,738 463,705 472,343 497,030
Stock options
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Antidilutive potential common shares                 11,868 [2] 16,402 [2] 21,905 [2]
Other share based awards
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Antidilutive potential common shares                 167 [2] 570 [2] 3,075 [2]
[1] The quarter ended July 27, 2013, includes the impact of the nonrecurring gain of $76.8 million resulting from the litigation settlement with A10 Networks, Inc.
[2] These amounts are excluded from the computation of diluted net income per-share.