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Commitments and Contingencies - Additional Information (Details) $ in Millions |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2019 USD ($) | May 30, 2017 USD ($) | May 25, 2017 USD ($) | Mar. 14, 2017 USD ($) | Mar. 03, 2017 USD ($) patent | May 12, 2016 USD ($) | Sep. 04, 2013 patent | Jul. 27, 2019 USD ($) | Jul. 28, 2018 USD ($) | Jul. 29, 2017 USD ($)
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  |  | $ 433.0 | $ 442.0 | $ 403.0
Liability for purchase commitments |  |  |  |  |  |  |  | 129.0 | 159.0 |
Future compensation expense & contingent consideration (maximum) |  |  |  |  |  |  |  | 440.0 |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |
Volume of channel partner financing |  |  |  |  |  |  |  | 29,600.0 | 28,200.0 | 27,000.0
Balance of the channel partner financing subject to guarantees |  |  |  |  |  |  |  | 1,400.0 | 1,000.0 |
Financing provided by third parties for leases and loans related to End Users on which the Company has provided guarantees |  |  |  |  |  |  |  | 14.0 | 35.0 | $ 51.0
Brazilian authority claim of import tax evasion by importer tax portion |  |  |  |  |  |  |  | 214.0 |  |
Brazilian authority claim of import tax evasion by importer interest portion |  |  |  |  |  |  |  | 1,400.0 |  |
Brazilian authority claim of import tax evasion by importer penalties portion |  |  |  |  |  |  |  | $ 1,000.0 |  |
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 patents infringed upon | patent |  |  |  |  |  |  | 2 |  |  |
Percentage of royalty awarded |  |  | 3.50% |  |  |  |  |  |  |
Pending Litigation | SRI International | Forecast |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Payment | $ 25.9 |  |  |  |  |  |  |  |  |
Patent Infringement | Pending Litigation | Sprint Communications Company L.P. Vs. Time Warner Cable Inc. |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Number of patents found infringed | patent |  |  |  |  | 5 |  |  |  |  |
Damages awarded, value |  |  |  | $ 139.8 | $ 139.8 |  |  |  |  |
Percentage of post-judgment interest awarded |  |  |  | 1.06% |  |  |  |  |  |
Pre-judgment interest requested |  | $ 20.3 |  |  |  |  |  |  |  |
Patent Indemnification |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Legal and indemnification settlement |  |  |  |  |  |  |  |  | 127.0 |
Minimum |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Warranty period for products |  |  |  |  |  |  |  | 90 days |  |
Channel partners revolving short-term financing payment term |  |  |  |  |  |  |  | 60 days |  |
Maximum |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Warranty period for products |  |  |  |  |  |  |  | 5 years |  |
Channel partners revolving short-term financing payment term |  |  |  |  |  |  |  | 90 days |  |
End user lease and loan term |  |  |  |  |  |  |  | 3 years |  |
Non-marketable equity securities and equity method investments |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  | $ 326.0 | $ 223.0 |

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