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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 08, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36468    
Entity Registrant Name ARISTA NETWORKS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-1751121    
Entity Address, Address Line One 5453 Great America Parkway    
Entity Address, City or Town Santa Clara    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95054    
City Area Code 408    
Local Phone Number 547-5500    
Title of 12(b) Security Common Stock, $0.0001 par value    
Trading Symbol ANET    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 21,908,602,716
Entity Common Stock, Shares Outstanding (in shares)   307,766,578  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s definitive Proxy Statement relating to its 2022 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A within 120 days after the registrant’s fiscal year end of December 31, 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001596532    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Ernst & Young LLP    
Auditor Location San Jose, California    
Auditor Firm ID 42