Commitments and Contingencies - Additional Information (Details) $ in Millions												3 Months Ended		6 Months Ended		12 Months Ended	56 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 ($)	Sep. 21, 2015 patent company	Sep. 04, 2013 patent	Jan. 23, 2021 USD ($)	Jan. 25, 2020 USD ($)	Jan. 23, 2021 USD ($)	Jan. 25, 2020 USD ($)	Jul. 25, 2020 USD ($)	Jan. 23, 2021 USD ($)
Contingency [Line Items]
Provision for purchase commitment liability														$ 44.0	$ 67.0
Future compensation expense & contingent consideration (up to)												$ 452.0		452.0			$ 452.0
Commitments and contingencies
Volume of channel partner financing												6,700.0	$ 6,600.0	12,800.0	14,200.0
Balance of the channel partner financing subject to guarantees												1,300.0		1,300.0		1,100.0	1,300.0
Financing provided by third parties for leases and loans on which the Company has provided guarantees												3.0	$ 1.0	$ 8.0	$ 6.0
Chanbond | Pending litigation
Contingency [Line Items]
Number of service provider companies | company										13
Number of allegedly infringed patents (patent) | patent										3
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. | Litigation resolved
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
Tax Year 2003 - 2007 | Brazilian tax authority
Contingency [Line Items]
Income tax examination, tax														$ 148.0
Income tax examination, interest														728.0
Income tax examination, penalties														$ 366.0
COVID-19
Contingency [Line Items]
Increase in certain channel partners revolving short-term financing payment term														30 days
Investments in privately held companies
Contingency [Line Items]
Commitments and contingencies												300.0		$ 300.0		300.0	300.0
Inventories
Contingency [Line Items]
Liability for purchase commitments												$ 152.0		152.0		141.0	$ 152.0
Inventories
Contingency [Line Items]
Purchase commitment														$ 4,600.0		$ 4,400.0