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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
Nov. 01, 2014
Aug. 02, 2014
May 03, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 27, 2013
Apr. 27, 2013
Jan. 26, 2013
Nov. 01, 2014
Oct. 26, 2013
Oct. 27, 2012
Basic net income per share                      
Net income                 $ 237,971us-gaap_NetIncomeLoss $ 208,623us-gaap_NetIncomeLoss $ 195,181us-gaap_NetIncomeLoss
Weighted-average shares used in computing basic net income per share 431,843us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 432,448us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 436,167us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 440,573us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 444,642us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 449,446us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 453,133us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 454,843us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 435,258us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 450,516us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 456,629us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income per share—basic $ 0.19us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ (0.03)us-gaap_EarningsPerShareBasic [1] $ 0.18us-gaap_EarningsPerShareBasic $ 0.14us-gaap_EarningsPerShareBasic $ 0.26us-gaap_EarningsPerShareBasic [2] $ 0.10us-gaap_EarningsPerShareBasic $ (0.05)us-gaap_EarningsPerShareBasic [3] $ 0.55us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 0.43us-gaap_EarningsPerShareBasic
Diluted net income per share                      
Net income                 $ 237,971us-gaap_NetIncomeLoss $ 208,623us-gaap_NetIncomeLoss $ 195,181us-gaap_NetIncomeLoss
Weighted-average shares used in computing diluted net income per share 441,649us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 441,789us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 436,167us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 453,549us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 460,237us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 461,344us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 466,919us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 454,843us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 446,859us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 463,705us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 472,343us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share—diluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted [1] $ 0.18us-gaap_EarningsPerShareDiluted $ 0.14us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted [2] $ 0.10us-gaap_EarningsPerShareDiluted $ (0.05)us-gaap_EarningsPerShareDiluted [3] $ 0.53us-gaap_EarningsPerShareDiluted $ 0.45us-gaap_EarningsPerShareDiluted $ 0.41us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding Reconciliation                      
Weighted-average shares used in computing basic net income per share 431,843us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 432,448us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 436,167us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 440,573us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 444,642us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 449,446us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 453,133us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 454,843us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 435,258us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 450,516us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 456,629us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive potential common shares in the form of stock options                 1,995us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 3,472us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 7,846us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Dilutive potential common shares in the form of other share-based awards                 9,606us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 9,717us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 7,868us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted-average shares used in computing diluted net income per share 441,649us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 441,789us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 436,167us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 453,549us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 460,237us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 461,344us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 466,919us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 454,843us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 446,859us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 463,705us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 472,343us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Stock options                      
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Antidilutive potential common shares                 1,725us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 [4] 11,868us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 [4] 16,402us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 [4]
Other share based awards                      
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Antidilutive potential common shares                 893us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 [4] 167us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 [4] 570us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 [4]
[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] 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.
[3] The quarter ended January 26, 2013, includes a discrete charge of $78.2 million to reduce previously recognized California deferred tax assets due to changes in California law resulting from the passage of Proposition 39 during fiscal year 2013.
[4] These amounts are excluded from the computation of diluted net income per share.