Commitments and Contingencies (Additional Information) (Details) $ in Millions								3 Months Ended	12 Months Ended
	May 30, 2017 USD ($)	May 25, 2017 USD ($)	Mar. 14, 2017 USD ($)	Mar. 03, 2017 USD ($) patent	May 12, 2016 USD ($)	Jan. 15, 2016 patent claim	Sep. 04, 2013 patent	Jan. 28, 2017 USD ($)	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($)	Jul. 25, 2015 USD ($)	Jul. 26, 2014 USD ($)	Jul. 28, 2012 USD ($)
Site Contingency [Line Items]
Rent expense									$ 403.0	$ 385.0	$ 394.0
Purchase commitments									4,640.0	3,896.0
Liability for purchase commitments									162.0	159.0
Future compensation expense & contingent consideration (maximum)									207.0
Commitments and contingencies
Volume of channel partner financing									27,000.0	26,900.0	25,900.0
Balance of the channel partner financing subject to guarantees									1,000.0	1,100.0
Financing provided by third parties for leases and loans related to End Users on which the Company has provided guarantees									51.0	63.0	107.0
Charge to product cost of sales									13,699.0	14,161.0	15,377.0
Brazilian authority claim of import tax evasion by importer tax portion									258.0
Brazilian authority claim of import tax evasion by importer interest portion									1,500.0
Brazilian authority claim of import tax evasion by importer penalties portion									$ 1,200.0
SRI International
Site Contingency [Line Items]
Damages awarded, value					$ 23.7
Pending Litigation | SRI International
Site Contingency [Line Items]
Damages awarded, value		$ 57.0
Number of allegedly infringed patents (patent) | patent							2
Percentage of royalty awarded		3.50%
Damages from Product Defects
Site Contingency [Line Items]
Charge for expected remediation								$ 125.0
Patent Infringement | Pending Litigation | Sprint Communications Company L.P. Vs. Time Warner Cable Inc.
Site Contingency [Line Items]
Number of patents found infringed (patent) | patent				5
Damages awarded, value			$ 139.8	$ 139.8
Percentage of post-judgment interest awarded			1.06%
Pre-judgment interest requested	$ 20.3
Patent Infringement | Pending Litigation | Huawei Technologies Co. Ltd. Vs. T-Mobile US, Inc.
Site Contingency [Line Items]
Number of patent infringement actions filed (claim) | claim						4
Number of allegedly infringed patents (patent) | patent						12
Minimum
Site Contingency [Line Items]
Warranty period for products, in days									90 days
Channel partners revolving short-term financing payment term									60 days
Maximum
Site Contingency [Line Items]
Warranty period for products, in years									5 years
Channel partners revolving short-term financing payment term									90 days
End user lease and loan term									3 years
Insieme Networks Inc
Site Contingency [Line Items]
Initial funding													$ 100.0
Payments to acquire additional interest in subsidiaries									$ 441.0	389.0
Compensation expense									47.0	160.0	207.0
Investments in privately held companies (impaired)
Site Contingency [Line Items]
Commitments and contingencies									216.0	222.0
Supplier Component Remediation Liability
Site Contingency [Line Items]
Commitments and contingencies									$ 174.0	276.0
Charge to product cost of sales												$ 655.0
Supplier Component Remediation Liability | Cost of Goods, Product Line
Site Contingency [Line Items]
Adjustments to product cost of sales								$ 141.0		$ (74.0)	$ (164.0)