Commitments And Contingencies Commitments And Contingencies (Legal Proceedings) (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jul. 30, 2016 USD ($)	Oct. 29, 2016 shares	May 27, 2016 $ / shares shares	Oct. 31, 2015 shares
Loss Contingencies [Line Items]
Common stock, shares outstanding		401,748		413,923
Ruckus [Member]
Loss Contingencies [Line Items]
Common stock, shares outstanding			92,200
Cash Per Share in Acquisition | $ / shares			$ 6.45
Common Stock Exchange in Acquisition			0.75
Business Combination, Consideration Transferred, Liabilities Incurred | $	$ 41.3
Ruckus [Member] | Shares Dissented [Member]
Loss Contingencies [Line Items]
Common stock, shares outstanding			3,200