| Cover Cover | Oct. 31, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 31, 2022 |
| Entity Registrant Name | ARISTA NETWORKS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36468 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value |
| Trading Symbol | ANET |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001596532 |
| Amendment Flag | false |
