Commitments and Contingencies - Additional Information (Details) $ in Millions											3 Months Ended		53 Months Ended
	Oct. 05, 2020 USD ($) patent	Apr. 30, 2020 patent	Apr. 01, 2020 USD ($)	Jun. 12, 2019 patent	Feb. 13, 2018 patent	May 25, 2017 USD ($)	Mar. 03, 2017 USD ($) patent	Jan. 06, 2017 patent	May 12, 2016 USD ($)	Sep. 04, 2013 patent	Oct. 24, 2020 USD ($)	Oct. 26, 2019 USD ($)	Oct. 24, 2020 USD ($)	Jul. 25, 2020 USD ($)
Contingency [Line Items]
Provision for purchase commitment liability											$ 32.0	$ 29.0
Future compensation expense & contingent consideration (up to)											495.0		$ 495.0
Commitments and contingencies
Volume of channel partner financing											6,100.0	7,600.0
Balance of the channel partner financing subject to guarantees											1,300.0		1,300.0	1,100.0
Financing provided by third parties for leases and loans on which the Company has provided guarantees											$ 5.0	5.0
SRI International | Pending Litigation
Contingency [Line Items]
Damages awarded, value			$ 8.0			$ 57.0			$ 23.7
Number of allegedly infringed patents (patent) | patent										2
Percentage of royalty awarded						3.50%
Payment													28.1
Centripetal | Pending Litigation
Contingency [Line Items]
Damages awarded, value	$ 1,900.0
Damages awarded, initial value	755.8
Damages awarded, enhanced damages for willful infringement	1,100.0
Damages awarded, pre-judgement interest	$ 13.7
Royalty awarded against revenue, first three-year term, percentage	10.00%
Royalty awarded against revenue, second three-year term, percentage	5.00%
Patent Infringement | Sprint Communications Company, L.P. vs. Time Warner Cable, Inc. | Pending Litigation
Contingency [Line Items]
Number of patents found infringed (patent) | patent							5
Damages awarded, value							$ 139.8
Pre and Post judgment interest awarded							$ 10.0
Patent Infringement | Centripetal | Pending Litigation
Contingency [Line Items]
Number of patents found infringed (patent) | patent	4
Number of allegedly infringed patents (patent) | patent					11
Number of allegedly infringed patents, petitioned (patent) | patent					9
Number of allegedly infringed patents, unpatentable (patent) | patent					5
Patent Infringement | Finjan | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent								5
Number of allegedly infringed patents, expired (patent) | patent								4
Patent Infringement | Ramot | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent				3
Patent Infringement, IPR Proceedings | Centripetal | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent					6
Patent Infringement, Patent Trial and Appeal Board | Centripetal | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent					7
Patent Infringement, Not Subject to IPR Proceedings | Centripetal | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent					5
Patent Infringement, Not Subject To IPR Proceedings and IPR Declined | Centripetal | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent					3
Patent Infringement, European Patents | Centripetal | Pending Litigation
Contingency [Line Items]
Number of allegedly infringed patents (patent) | patent		3
Minimum
Contingency [Line Items]
Warranty period for products											90 days
Channel partners revolving short-term financing payment term											60 days
Minimum | Centripetal | Pending Litigation
Contingency [Line Items]
Annual royalty awarded against revenue, first three-year term	$ 167.7
Annual royalty awarded against revenue, second three-year term	83.9
Maximum
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
Maximum | Centripetal | Pending Litigation
Contingency [Line Items]
Annual royalty awarded against revenue, first three-year term	300.1
Annual royalty awarded against revenue, second three-year term	$ 150.0
Investments in privately held companies (impaired)
Contingency [Line Items]
Commitments and contingencies											$ 300.0		300.0	300.0
Tax Year 2003 - 2007 | Brazilian tax authority
Contingency [Line Items]
Income tax examination, tax											100.0
Income tax examination, interest											700.0
Income tax examination, penalties											$ 400.0
COVID-19
Contingency [Line Items]
Increase in certain channel partners revolving short-term financing payment term											30 days
Inventories
Contingency [Line Items]
Liability for purchase commitments											$ 157.0		$ 157.0	$ 141.0
Inventories
Contingency [Line Items]
Purchase commitment											$ 4,200.0	$ 4,400.0