Acquisitions and Divestitures Acquisitions (Narrative) (Details) $ / shares in Units, shares in Thousands	3 Months Ended			12 Months Ended
	Jul. 30, 2016 USD ($) employess	May 02, 2015 USD ($)	Nov. 01, 2014 USD ($)	Oct. 29, 2016 USD ($) shares	Oct. 31, 2015 USD ($) shares	Nov. 01, 2014 USD ($)	May 27, 2016 USD ($) $ / shares shares
Business Acquisition
Common stock, shares outstanding | shares				401,748	413,923
Acquisition and integration costs				$ 28,922,000	$ 3,942,000	$ 0
Goodwill			$ 1,567,723,000	2,295,184,000	1,617,161,000	1,567,723,000
Goodwill, Purchase Accounting Adjustments				$ 0	$ (15,000)
Finite-Lived Intangible Asset, Useful Life				6 years 29 days	6 years 6 months 18 days
Ruckus [Member]
Business Acquisition
Cash Per Share in Acquisition | $ / shares							$ 6.45
Common Stock Exchange in Acquisition							0.75
Common stock, shares outstanding | shares							92,200
Share Price | $ / shares							$ 8.60
Effective Date of Acquisition	May 27, 2016
Total purchase price	$ 1,275,060,000
Cash consideration	574,000,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	574,000,000
Business Combination, Consideration Transferred, Liabilities Incurred	41,300,000
Integration Related Costs				$ 12,292,000
Goodwill							$ 673,748,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount							$ 0
Business Combination, Provisional Information, Initial Accounting Incomplete, Items				The total preliminary purchase allocation reflects the Company’s preliminary estimates and is subject to revision as additional information in relation to the fair value of the inventories, identifiable intangible assets, and deferred revenue assumed becomes available.
Goodwill, Purchase Accounting Adjustments				$ 29,000,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Reasons				Additional information that existed as of the Acquisition Date may become known to the Company during the remainder of the measurement period.
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				$ 181,481,000
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Effective Date of Acquisition		Mar. 01, 2015
Total purchase price		$ 96,100,000
Cash consideration		95,500,000
Cash Acquired from Acquisition		100,000
Other consideration transferred		$ 500,000
Integration Related Costs				$ 0	$ 2,500,000
Separately Recognized Transactions, Acquisition Cost Expensed, Financial Statement Caption				Acquisition and integration costs.
Vistapointe
Business Acquisition
Effective Date of Acquisition			Sep. 11, 2014
Total purchase price			$ 16,900,000
Cash consideration			16,900,000
Acquisition Cost Expensed			400,000
Acquisition Costs [Member] | Ruckus [Member]
Business Acquisition
Acquisition and integration costs				$ 15,680,000
Acquisition Costs [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Acquisition Cost Expensed				$ 0	1,400,000
Restricted stock units | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Separately Recognized Transactions, Accounting Method				The RSUs were accounted for as stock-based compensation expense
Separately Recognized Transactions, Expenses and Losses Recognized				$ 2,500,000	1,600,000
Deferred Bonus [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition
Separately Recognized Transactions, Accounting Method				The cash awards were accounted for as employee compensation expense
Separately Recognized Transactions, Expenses and Losses Recognized				$ 4,200,000	4,800,000
Shares Dissented [Member] | Ruckus [Member]
Business Acquisition
Common stock, shares outstanding | shares							3,200
Vested Options [Member] | Ruckus [Member]
Business Acquisition
Other consideration transferred	78,300,000
Replacement Awards [Member] | Ruckus [Member]
Business Acquisition
Other consideration transferred	$ 7,400,000
IP Networking Products
Business Acquisition
Goodwill			1,235,961,000	1,569,427,000	1,285,420,000	1,235,961,000
Goodwill, Purchase Accounting Adjustments				0	(15,000)
IP Networking Products | Ruckus [Member]
Business Acquisition
Goodwill							$ 279,700,000
Global Services
Business Acquisition
Goodwill			$ 155,416,000	549,437,000	155,416,000	$ 155,416,000
Goodwill, Purchase Accounting Adjustments				0	$ 0
Global Services | Ruckus [Member]
Business Acquisition
Goodwill							$ 394,000,000
With Immediate Acceleration [Member] | Ruckus [Member]
Business Acquisition
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected | employess	9
Without Immediate Acceleration [Member] | Ruckus [Member]
Business Acquisition
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected | employess	4
Immediate Acceleration of Vested Options [Member] | Ruckus [Member]
Business Acquisition
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost				6,106,000
Other Post-Combination Expense [Member] | Ruckus [Member]
Business Acquisition
Separately Recognized Transaction, Unamortized Stock Compensation Expense				$ 21,800,000