$ANET
Arista Networks, Inc. Stock $anet

$anet Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000159653220000024 Filed on February 14, 2020

Income Statement

Concept	2019 Q4	2019 Q1	2019
Revenue	$552.5M	$595.4M	$2.411B
YoY Change	-7.25%	26.02%	12.05%
Cost Of Revenue	$196.2M	$214.9M	$866.4M
YoY Change	-11.1%	26.71%	11.36%
Gross Profit	$356.3M	$380.6M	$1.544B
YoY Change	-4.98%	25.63%	12.45%
Gross Profit Margin	64.48%	63.92%	64.06%
Selling, General & Admin	$70.25M	$66.56M	$275.8M
YoY Change	11.67%	7.67%	9.2%
% of Gross Profit	19.72%	17.49%	17.86%
Research & Development	$110.1M	$119.7M	$462.8M
YoY Change	-7.07%	16.91%	4.59%
% of Gross Profit	30.89%	31.44%	29.96%
Depreciation & Amortization	$7.900M	$8.362M	$32.85M
YoY Change	-15.05%	46.78%	18.71%
% of Gross Profit	2.22%	2.2%	2.13%
Operating Expenses	$180.3M	$186.2M	$738.6M
YoY Change	-0.57%	13.43%	-32.86%
Operating Profit	$176.0M	$194.3M	$805.8M
YoY Change	-9.12%	40.08%	194.78%
Interest Expense	$12.70M	$0.00	$56.60M
YoY Change	188.64%	-100.0%	1995.52%
% of Operating Profit	7.22%	0.0%	7.02%
Other Income/Expense, Net	$11.18M	$12.33M	$56.50M
YoY Change	130.67%	196.75%	265.58%
Pretax Income	$187.2M	$206.7M	$862.3M
YoY Change	-5.7%	44.64%	198.57%
Income Tax	-$73.52M	$5.646M	$2.403M
% Of Pretax Income	-39.28%	2.73%	0.28%
Net Earnings	$260.7M	$201.0M	$859.9M
YoY Change	53.06%	39.08%	162.06%
Net Earnings / Revenue	47.18%	33.76%	35.67%
Basic Earnings Per Share	$3.41	$2.65	$2.82
Diluted Earnings Per Share	$3.25	$2.47	$2.66
COMMON SHARES
Basic Shares Outstanding	76.40M shares	75.92M shares	305.2M shares
Diluted Shares Outstanding		81.20M shares	323.5M shares

Balance Sheet

Concept	2019 Q4	2019 Q1	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$2.724B	$2.151B	$2.724B
YoY Change	39.27%	23.76%	39.28%
Cash & Equivalents	$1.111B	$809.5M	$1.111B
Short-Term Investments	$1.613B	$1.341B	$1.613B
Other Short-Term Assets	$64.46M	$63.44M	$72.20M
YoY Change	-32.66%	-23.42%	-48.94%
Inventory	$243.8M	$347.2M	$257.5M
Prepaid Expenses
Receivables	$392.0M	$271.2M	$417.6M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.472B	$2.901B	$3.472B
YoY Change	27.88%	21.93%	27.88%
LONG-TERM ASSETS
Property, Plant & Equipment	$39.27M	$42.55M	$127.0M
YoY Change	-47.88%	-42.37%	68.44%
Goodwill	$54.86M	$53.68M
YoY Change	2.18%
Intangibles
YoY Change
Long-Term Investments	$4.200M	$31.50M	$4.200M
YoY Change	-86.14%	-12.74%	-86.14%
Other Assets	$30.35M	$25.06M	$482.4M
YoY Change	33.66%	9.55%	223.32%
Total Long-Term Assets	$713.7M	$431.5M	$713.7M
YoY Change	94.36%	114.81%	94.36%
TOTAL ASSETS
Total Short-Term Assets	$3.472B	$2.901B	$3.472B
Total Long-Term Assets	$713.7M	$431.5M	$713.7M
Total Assets	$4.185B	$3.332B	$4.185B
YoY Change	35.8%	29.16%	35.8%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$92.11M	$89.82M	$92.10M
YoY Change	-1.76%	27.53%	-1.81%
Accrued Expenses	$140.2M	$104.2M	$156.3M
YoY Change	13.79%	21.58%	26.76%
Deferred Revenue	$312.7M	$304.7M
YoY Change	-12.81%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$597.1M	$543.2M	$597.1M
YoY Change	-1.55%	18.66%	-1.55%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change	-100.0%	-100.0%	-100.0%
Other Long-Term Liabilities	$37.69M	$24.44M	$438.8M
YoY Change	34.15%	14.5%	47.89%
Total Long-Term Liabilities	$37.69M	$24.44M	$438.8M
YoY Change	34.15%	14.5%	32.13%
TOTAL LIABILITIES
Total Short-Term Liabilities	$597.1M	$543.2M	$597.1M
Total Long-Term Liabilities	$37.69M	$24.44M	$438.8M
Total Liabilities	$1.291B	$932.1M	$1.291B
YoY Change	37.5%	26.81%	37.5%
SHAREHOLDERS EQUITY
Retained Earnings	$1.788B	$1.195B
YoY Change	50.17%	18.59%
Common Stock	$8.000K	$8.000K
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.895B	$2.400B	$2.895B
YoY Change
Total Liabilities & Shareholders Equity	$4.185B	$3.332B	$4.185B
YoY Change	35.8%	29.16%	35.8%

Cashflow Statement

Concept	2019 Q4	2019 Q1	2019
OPERATING ACTIVITIES
Net Income	$260.7M	$201.0M	$859.9M
YoY Change	53.06%	39.08%	162.06%
Depreciation, Depletion And Amortization	$7.900M	$8.362M	$32.85M
YoY Change	-15.05%	46.78%	18.71%
Cash From Operating Activities	$327.1M	$170.1M	$963.0M
YoY Change	10.58%	-13.01%	91.41%
INVESTING ACTIVITIES
Capital Expenditures	-$2.500M	$5.237M	$15.75M
YoY Change	-59.68%	-17.35%	-33.9%
Acquisitions		$0.00	$1.365M
YoY Change			-98.59%
Other Investing Activities	-$261.6M	-$30.00M	$0.00
YoY Change	58.07%	-83.1%
Cash From Investing Activities	-$264.1M	-$35.22M	-$284.1M
YoY Change	53.9%	-80.84%	-62.38%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00	$266.1M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-48.50M	$24.47M	-$218.0M
YoY Change	-3131.25%	59.87%	-608.66%
NET CHANGE
Cash From Operating Activities	327.1M	$170.1M	$963.0M
Cash From Investing Activities	-264.1M	-$35.22M	-$284.1M
Cash From Financing Activities	-48.50M	$24.47M	-$218.0M
Net Change In Cash	14.50M	$159.5M	$461.4M
YoY Change	-88.47%	491.54%	-319.13%
FREE CASH FLOW
Cash From Operating Activities	$327.1M	$170.1M	$963.0M
Capital Expenditures	-$2.500M	$5.237M	$15.75M
Free Cash Flow	$329.6M	$164.9M	$947.3M
YoY Change	9.14%	-12.87%	97.64%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018Q4	anet	Allowance For Doubtful Accounts And Product Sales Return Reserve AllowanceForDoubtfulAccountsAndProductSalesReturnReserve	9120000	USD
CY2019Q4	anet	Allowance For Doubtful Accounts And Product Sales Return Reserve AllowanceForDoubtfulAccountsAndProductSalesReturnReserve	6160000	USD
CY2018Q4	anet	Restricted Cash Pledged As Collateral RestrictedCashPledgedAsCollateral	4000000	USD
CY2019	anet	Warranty Termon Hardware Products WarrantyTermonHardwareProducts	P1Y
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001596532
CY2018	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	0	USD
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75668000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	76389000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75668000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	76389000	shares
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	1200000	USD
CY2017	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.0001
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.0001
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P2Y
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P3Y
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-36468
CY2019	dei	Entity Registrant Name EntityRegistrantName	ARISTA NETWORKS, INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-1751121
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	5453 Great America Parkway
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Santa Clara
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	95054
CY2019	dei	City Area Code CityAreaCode	408
CY2019	dei	Local Phone Number LocalPhoneNumber	547-5500
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.0001 par value
CY2019	dei	Trading Symbol TradingSymbol	ANET
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	15382416460	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	1306197000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	76479227	shares
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1111286000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	649950000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	1613082000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	391987000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	331777000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	243825000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	264557000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	111456000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	162321000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	3471636000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	2714802000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39273000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	75355000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	45235000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	58610000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	54855000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	53684000	USD
CY2019Q4	us-gaap	Long Term Investments LongTermInvestments	4150000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	30336000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	87770000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	452025000	USD
CY2018Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	126492000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	30346000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	22704000	USD
CY2019Q4	us-gaap	Assets Assets	4185290000	USD
CY2018Q4	us-gaap	Assets Assets	3081983000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	92105000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	93757000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	140249000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	123254000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	312668000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	358586000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	52052000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	30907000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	597074000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	606504000	USD
CY2019Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	55485000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	36167000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	83022000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	0	USD
CY2018Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	35431000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	262620000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	228641000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	254710000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	3753000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	37693000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28098000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1290604000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	938594000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	8000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	8000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1106305000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	956572000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1788230000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1190803000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	143000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3994000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2894686000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2143389000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4185290000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3081983000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2410706000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2151369000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1646186000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	866368000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	777992000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	584417000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1544338000	USD
CY2018	us-gaap	Gross Profit GrossProfit	1373377000	USD
CY2017	us-gaap	Gross Profit GrossProfit	1061769000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	462759000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	442468000	USD
CY2017	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	349594000	USD
CY2019	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	213907000	USD
CY2018	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	187142000	USD
CY2017	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	155105000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	61898000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	65420000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	86798000	USD
CY2019	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2018	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	405000000	USD
CY2017	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	738564000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	1100030000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	591497000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	805774000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	273347000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	470272000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	56496000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	15454000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	4488000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	862270000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	288801000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	474760000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2403000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-39314000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	51559000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	859867000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	328115000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	423201000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	859444000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	327926000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	422400000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	859468000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	327941000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	422468000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	11.26
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.39
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.85
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.63
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.06
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.35
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	76312000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74750000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72258000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80879000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80844000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	78977000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	859867000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	328115000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	423201000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-686000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2069000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	672000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	4823000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	13000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1135000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4137000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2056000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-463000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	864004000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	326059000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	422738000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1107820000	USD
CY2017Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	2279000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	423201000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-463000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	75427000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	57111000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4025000	USD
CY2017	anet	Adjustments To Additional Paid In Capital Vesting Of Stock Options And Restricted Stock AdjustmentsToAdditionalPaidInCapitalVestingOfStockOptionsAndRestrictedStock	564000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1661914000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3574000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	328115000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2056000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	91202000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	53658000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	8878000	USD
CY2018	anet	Adjustments To Additional Paid In Capital Vesting Of Stock Options And Restricted Stock AdjustmentsToAdditionalPaidInCapitalVestingOfStockOptionsAndRestrictedStock	305000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	15555000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	2143389000	USD
CY2019Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3702000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	859867000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4137000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	101280000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	57377000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	266142000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	9200000	USD
CY2019	anet	Adjustments To Additional Paid In Capital Vesting Of Stock Options And Restricted Stock AdjustmentsToAdditionalPaidInCapitalVestingOfStockOptionsAndRestrictedStock	276000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2894686000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	859867000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	328115000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	101280000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	91202000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	75427000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	423201000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	32849000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	27671000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	20640000	USD
CY2019	anet	Noncash Lease Expense NoncashLeaseExpense	16179000	USD
CY2018	anet	Noncash Lease Expense NoncashLeaseExpense	0	USD
CY2017	anet	Noncash Lease Expense NoncashLeaseExpense	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-75741000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-57896000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8426000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	5427000	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-13800000	USD
CY2017	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	0	USD
CY2019	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	6771000	USD
CY2018	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	3360000	USD
CY2017	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-1452000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	60210000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	77916000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-5773000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-20927000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-51054000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	69708000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-54259000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-21411000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11645000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	8112000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	3389000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-907000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-1937000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	39337000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-30104000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	16366000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-14786000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	43535000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-11939000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	70533000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	142327000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	23523000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-112000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	19921000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7921000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	17455000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	1475000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	963034000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	503119000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	631627000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1208717000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	547797000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	206332000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1503893000	USD
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1174259000	USD
CY2017	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	585373000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1365000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	96821000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15751000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	23830000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15279000	USD
CY2019	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	28220000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	8000000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-284072000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-755113000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-391320000	USD
CY2019	anet	Repayments Of Longterm Lease Financing Obligations RepaymentsOfLongtermLeaseFinancingObligations	0	USD
CY2018	anet	Repayments Of Longterm Lease Financing Obligations RepaymentsOfLongtermLeaseFinancingObligations	1929000	USD
CY2017	anet	Repayments Of Longterm Lease Financing Obligations RepaymentsOfLongtermLeaseFinancingObligations	1617000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	57378000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	53658000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	57111000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9200000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	8878000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4025000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	266142000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-217964000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	42851000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	51469000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	353000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1390000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	753000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	461351000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-210533000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	292529000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	654164000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	864697000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	572168000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1115515000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	654164000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	864697000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	32832000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	17573000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	44216000	USD
CY2019	anet	Interest Paid Lease Financing Obligation InterestPaidLeaseFinancingObligation	0	USD
CY2018	anet	Interest Paid Lease Financing Obligation InterestPaidLeaseFinancingObligation	2692000	USD
CY2017	anet	Interest Paid Lease Financing Obligation InterestPaidLeaseFinancingObligation	2814000	USD
CY2019	anet	Right Of Use Asset Obtained In Exchange For Operating Lease Liability Recorded Upon Adoption RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityRecordedUponAdoption	93207000	USD
CY2018	anet	Right Of Use Asset Obtained In Exchange For Operating Lease Liability Recorded Upon Adoption RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityRecordedUponAdoption	0	USD
CY2017	anet	Right Of Use Asset Obtained In Exchange For Operating Lease Liability Recorded Upon Adoption RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityRecordedUponAdoption	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	10948000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2018	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	15555000	USD
CY2017	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	2120000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	2340000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3811000	USD
CY2019	anet	Adjustmentsto Additional Paidin Capital Vestingof Early Exercised Stock Options AdjustmentstoAdditionalPaidinCapitalVestingofEarlyExercisedStockOptions	276000	USD
CY2018	anet	Adjustmentsto Additional Paidin Capital Vestingof Early Exercised Stock Options AdjustmentstoAdditionalPaidinCapitalVestingofEarlyExercisedStockOptions	305000	USD
CY2017	anet	Adjustmentsto Additional Paidin Capital Vestingof Early Exercised Stock Options AdjustmentstoAdditionalPaidinCapitalVestingofEarlyExercisedStockOptions	564000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:8px;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of the accompanying consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the consolidated financial statements and accompanying notes. Those estimates and assumptions include, but are not limited to, revenue recognition and deferred revenue; allowance for doubtful accounts, sales rebates and return reserves; valuation of goodwill and acquisition-related intangible assets, accounting for income taxes, including the recognition of deferred tax assets and liabilities related to an intra-entity transaction to sell our non-Americas economic and beneficial intellectual property, valuation allowance on deferred tax assets and reserves for uncertain tax positions; estimate of useful lives of long-lived assets including intangible assets; valuation of inventory and contract manufacturer/supplier liabilities; and the recognition and measurement of contingent liabilities. We evaluate our estimates and assumptions based on historical experience and other factors and adjust those estimates and assumptions when facts and circumstances dictate. Actual results could differ materially from those estimates.</span></div>
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;padding-top:8px;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities, restricted cash, and accounts receivable. Our cash equivalents, restricted cash and marketable securities are invested in high quality financial instruments with banks and financial institutions. Such deposits may be in excess of insured limits provided on such deposits. </span></div><div style="line-height:120%;padding-top:8px;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Our accounts receivable are unsecured and represent amounts due to us based on contractual obligations </span></div><div style="line-height:120%;padding-top:8px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">of our customers. We mitigate credit risk with respect to accounts receivable by performing ongoing credit evaluations of our customers to assess the probability of collection based on a number of factors, including past transaction experience with the customer, evaluation of their credit history, the credit limits extended, and review of the invoicing terms of the arrangement. In situations where a customer may be thinly capitalized and we have limited payment history with it, we will either establish a small credit limit or require it to prepay its purchases. We generally do not require our customers to provide collateral to support accounts receivable. We have recorded an allowance for doubtful accounts for those receivables that we have determined not to be collectible. We mitigate credit risk in respect to the notes receivable by performing ongoing credit evaluations of the borrower to assess the probability of collecting all amounts due to us under the existing contractual terms. </span></div><div style="line-height:120%;padding-top:8px;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">We market and sell our products through both our direct sales force and our channel partners, including distributors, value-added resellers, system integrators and original equipment manufacturer (“OEM”) partners, and in conjunction with various technology partners. Significant customers are those which represent more than </span><span style="font-family:inherit;font-size:10pt;">10%</span><span style="font-family:inherit;font-size:10pt;"> of our total net revenue during the period or net accounts receivable balance at each respective balance sheet date. As of December 31, </span><span style="font-family:inherit;font-size:10pt;">2019</span><span style="font-family:inherit;font-size:10pt;">, we had </span><span style="font-family:inherit;font-size:10pt;">one</span><span style="font-family:inherit;font-size:10pt;"> customer who represented </span><span style="font-family:inherit;font-size:10pt;"><span>39%</span></span><span style="font-family:inherit;font-size:10pt;"> of total accounts receivable. As of December 31, </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;">, we had </span><span style="font-family:inherit;font-size:10pt;">two</span><span style="font-family:inherit;font-size:10pt;"> customers who represented </span><span style="font-family:inherit;font-size:10pt;"><span>35%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>10%</span></span><span style="font-family:inherit;font-size:10pt;"> of total accounts receivable, respectively. For the year ended December 31, </span><span style="font-family:inherit;font-size:10pt;">2019</span><span style="font-family:inherit;font-size:10pt;">, there were two customers who represented </span><span style="font-family:inherit;font-size:10pt;"><span>23%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>17%</span></span><span style="font-family:inherit;font-size:10pt;"> of our total revenue, respectively. For the years ended December 31, </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2017</span><span style="font-family:inherit;font-size:10pt;">, there was one customer who represented </span><span style="font-family:inherit;font-size:10pt;"><span>27%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>16%</span></span><span style="font-family:inherit;font-size:10pt;"> of our total revenue, respectively.</span></div>
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4000000.0	USD
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	41200000	USD
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	20800000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	28100000	USD
CY2019	anet	Contract Manufacturerand Supplier Liability ContractManufacturerandSupplierLiability	11700000	USD
CY2017	anet	Contract Manufacturerand Supplier Liability ContractManufacturerandSupplierLiability	21200000	USD
CY2018	anet	Contract Manufacturerand Supplier Liability ContractManufacturerandSupplierLiability	0	USD
CY2019	us-gaap	Property Plant And Equipment Useful Life PropertyPlantAndEquipmentUsefulLife	P3Y
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Amortization Period CapitalizedContractCostAmortizationPeriod	P5Y
CY2019Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	8900000	USD
CY2018Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	6400000	USD
CY2019	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	<div style="line-height:120%;padding-top:8px;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">We offer a </span><span style="font-family:inherit;font-size:10pt;">one</span><span style="font-family:inherit;font-size:10pt;">-year warranty on all of our hardware products and a </span><span style="font-family:inherit;font-size:10pt;"><span>90</span></span><span style="font-family:inherit;font-size:10pt;">-day warranty against defects in the software embedded in the products. We use judgment and estimates when determining warranty costs based on historical costs to replace product returns within the warranty period at the time we recognize revenue. We accrue for potential warranty claims at the time of shipment as a component of cost of revenues based on historical experience and other relevant information. We reserve for specifically identified products if and when we determine we have a systemic product failure. Although we engage in extensive product quality programs, if actual product failure rates or use of materials differ from estimates, additional warranty costs may be incurred, which could reduce our gross margin. The accrued warranty liability is recorded in accrued liabilities in the accompanying consolidated balance sheets. </span></div>
CY2019	anet	Warranty Termon Software Embeddedin Products WarrantyTermonSoftwareEmbeddedinProducts	P90D
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	75355000	USD
CY2019Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	42549000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	93207000	USD
CY2018Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	126492000	USD
CY2019Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	125327000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	30907000	USD
CY2019Q1	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	41056000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	88230000	USD
CY2018Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	35431000	USD
CY2019Q1	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	0	USD
CY2018Q4	us-gaap	Deferred Tax And Other Liabilities Noncurrent DeferredTaxAndOtherLiabilitiesNoncurrent	31851000	USD
CY2019Q1	us-gaap	Deferred Tax And Other Liabilities Noncurrent DeferredTaxAndOtherLiabilitiesNoncurrent	24437000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1190803000	USD
CY2019Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1194505000	USD
CY2019Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	566581000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	566581000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1609833000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3383000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	134000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1613082000	USD
CY2019Q4	anet	Cash Equivalents Marketable Securities And Other Assets Amortized Cost CashEquivalentsMarketableSecuritiesAndOtherAssetsAmortizedCost	2180643000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3383000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	134000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	2183892000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1307771000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	622000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2196000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1306197000	USD
CY2018Q4	anet	Cash Equivalents Marketable Securities And Other Assets Amortized Cost CashEquivalentsMarketableSecuritiesAndOtherAssetsAmortizedCost	1634065000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	622000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2196000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1632491000	USD
CY2019	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	0	USD
CY2019	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Term DebtSecuritiesAvailableForSaleTerm	P24M
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	915069000	USD
CY2019Q4	anet	Available For Sale Securities Debt Maturities Year One Through Two Fair Value AvailableForSaleSecuritiesDebtMaturitiesYearOneThroughTwoFairValue	698013000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1613082000	USD
CY2019	anet	Marketable Securities Weighted Average Remaining Life MarketableSecuritiesWeightedAverageRemainingLife	P0Y9M18D
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1111286000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	649950000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	4229000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	4214000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1115515000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	654164000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	398147000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	340897000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	638000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	507000	USD
CY2019Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	5522000	USD
CY2018Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	8613000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	391987000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	331777000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	507000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	112000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	204000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	221000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	500000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	17000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	90000	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	105000	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	109000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	638000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	507000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	112000	USD
CY2018Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	8613000	USD
CY2017Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	7423000	USD
CY2016Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	1317000	USD
CY2019	anet	Sales Return Reserve Chargedto Revenue SalesReturnReserveChargedtoRevenue	2032000	USD
CY2018	anet	Sales Return Reserve Chargedto Revenue SalesReturnReserveChargedtoRevenue	4269000	USD
CY2017	anet	Sales Return Reserve Chargedto Revenue SalesReturnReserveChargedtoRevenue	17371000	USD
CY2019	anet	Return Reserve Consumption ReturnReserveConsumption	5123000	USD
CY2018	anet	Return Reserve Consumption ReturnReserveConsumption	3079000	USD
CY2017	anet	Return Reserve Consumption ReturnReserveConsumption	11265000	USD
CY2019Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	5522000	USD
CY2018Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	8613000	USD
CY2017Q4	anet	Product Return Reserve Current ProductReturnReserveCurrent	7423000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	96712000	USD
CY2018Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	76795000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	147113000	USD
CY2018Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	187762000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	243825000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	264557000	USD
CY2019Q4	anet	Inventory Deposit Current InventoryDepositCurrent	13716000	USD
CY2018Q4	anet	Inventory Deposit Current InventoryDepositCurrent	14639000	USD
CY2019Q4	us-gaap	Prepaid Taxes PrepaidTaxes	20153000	USD
CY2018Q4	us-gaap	Prepaid Taxes PrepaidTaxes	38636000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	64464000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	95730000	USD
CY2019Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	13123000	USD
CY2018Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	13316000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	111456000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	162321000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	136649000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	165367000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	97376000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	90012000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39273000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	75355000	USD
CY2019	us-gaap	Depreciation Depreciation	19000000.0	USD
CY2018	us-gaap	Depreciation Depreciation	21600000	USD
CY2017	us-gaap	Depreciation Depreciation	20200000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	80133000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	70755000	USD
CY2019Q4	anet	Accrued Manufacturing Costs Current AccruedManufacturingCostsCurrent	31920000	USD
CY2018Q4	anet	Accrued Manufacturing Costs Current AccruedManufacturingCostsCurrent	31336000	USD
CY2019Q4	anet	Accrued Product Development Costs Current AccruedProductDevelopmentCostsCurrent	11410000	USD
CY2018Q4	anet	Accrued Product Development Costs Current AccruedProductDevelopmentCostsCurrent	6988000	USD
CY2019Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	6742000	USD
CY2018Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	5362000	USD
CY2019Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	6335000	USD
CY2018Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	5678000	USD
CY2019Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	1716000	USD
CY2018Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	839000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	1993000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	2296000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	140249000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	123254000	USD
CY2018Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	5362000	USD
CY2017Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	7415000	USD
CY2019	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	7169000	USD
CY2018	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	3565000	USD
CY2019	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	5789000	USD
CY2018	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	5618000	USD
CY2019Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	6742000	USD
CY2018Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	5362000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	6341000	USD
CY2017Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	25565000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	6341000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	32595000	USD
CY2017Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	16521000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	12887000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	7561000	USD
CY2019	anet	Contract With Customer Liability Beginning Balance Reclassified To Deferred Revenue ContractWithCustomerLiabilityBeginningBalanceReclassifiedToDeferredRevenue	894000	USD
CY2018	anet	Contract With Customer Liability Beginning Balance Reclassified To Deferred Revenue ContractWithCustomerLiabilityBeginningBalanceReclassifiedToDeferredRevenue	371000	USD
CY2019	anet	Contract With Customer Liability Contract Liabilities Recognized ContractWithCustomerLiabilityContractLiabilitiesRecognized	42236000	USD
CY2018	anet	Contract With Customer Liability Contract Liabilities Recognized ContractWithCustomerLiabilityContractLiabilitiesRecognized	24006000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	61050000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	32595000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	587227000	USD
CY2019	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	351617000	USD
CY2019	us-gaap	Deferred Revenue Period Increase Decrease DeferredRevenuePeriodIncreaseDecrease	339678000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	575288000	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	691900000	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.78
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.22
CY2019	us-gaap	Interest Income Other InterestIncomeOther	51144000	USD
CY2018	us-gaap	Interest Income Other InterestIncomeOther	31666000	USD
CY2017	us-gaap	Interest Income Other InterestIncomeOther	8093000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	0	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	2701000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	2780000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	5427000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-13800000	USD
CY2017	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	0	USD
CY2019	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	-75000	USD
CY2018	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	289000	USD
CY2017	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	-825000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	56496000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	15454000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	4488000	USD
CY2019Q4	anet	Equity Securities Without Readily Determinable Fair Value Initial Costs EquitySecuritiesWithoutReadilyDeterminableFairValueInitialCosts	3000000	USD
CY2018Q4	anet	Equity Securities Without Readily Determinable Fair Value Initial Costs EquitySecuritiesWithoutReadilyDeterminableFairValueInitialCosts	44136000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	0	USD
CY2018Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	15000000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	1150000	USD
CY2018Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	1200000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	4150000	USD
CY2018Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	30336000	USD
CY2019	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	4300000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	1200000	USD
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	15000000.0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	63720000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	18485000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	45235000	USD
CY2019	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P3Y10M24D
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	63720000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5110000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	58610000	USD
CY2018	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P4Y8M12D
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13400000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5100000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	12337000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12048000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	11513000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	7690000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1011000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	636000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	45235000	USD
CY2013Q3	anet	Lessee Leasing Arrangements Financing Obligation Term Of Contract LesseeLeasingArrangementsFinancingObligationTermOfContract	P120M
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	87770000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	16052000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	83022000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	99074000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	22544000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	6255000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	28799000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	18600000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	12900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	20563000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	21303000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	21491000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	17702000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	9786000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	26220000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	117065000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	17991000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	99074000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.051
CY2019Q4	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	294700000	USD
CY2019Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	1000000000.0	USD
CY2019Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	733900000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4564000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	70000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	37.86
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5899000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	37.09
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y2M12D
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1027741000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	76000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	226.53
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1341000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	29.38
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	42.50
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y4M24D
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	740387000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2755000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	28.22
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y10M24D
CY2019Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	482712000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	107.42
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	121.18
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	40.17
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	323100000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	283800000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	307700000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	15146000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	15386000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized	0	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	76000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	70000	shares
CY2019	anet	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Shares Traded For Taxes ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesTradedForTaxes	41000	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	101280000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	91202000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	75427000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	859867000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	328115000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	423201000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	423000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	189000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	801000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	859444000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	327926000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	422400000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	859444000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	327926000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	422400000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	24000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	15000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	68000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	859468000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	327941000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	422468000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	76312000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74750000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72258000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	76312000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74750000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72258000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4565000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	6083000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	6599000	shares
CY2019	anet	Incremental Common Shares Attributable To Dilutive Effect Of Employee Stock Purchase Plan IncrementalCommonSharesAttributableToDilutiveEffectOfEmployeeStockPurchasePlan	2000	shares
CY2018	anet	Incremental Common Shares Attributable To Dilutive Effect Of Employee Stock Purchase Plan IncrementalCommonSharesAttributableToDilutiveEffectOfEmployeeStockPurchasePlan	11000	shares
CY2017	anet	Incremental Common Shares Attributable To Dilutive Effect Of Employee Stock Purchase Plan IncrementalCommonSharesAttributableToDilutiveEffectOfEmployeeStockPurchasePlan	120000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80879000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80844000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	78977000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	11.26
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.39
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.85
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.63
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.06
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.35
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	211000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	58000	shares
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	727632000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	136818000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	373221000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	134638000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	151983000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	101539000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	862270000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	288801000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	474760000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	58187000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6113000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	31935000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	19067000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2018000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3645000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	928000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	10451000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	7322000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	78182000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	18582000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42902000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	362056000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-57726000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	12795000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4511000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4164000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3404000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-433324000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	3994000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-734000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-75779000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-57896000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	8657000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2403000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-39314000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	51559000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0130
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.0059
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0003
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.0259
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.0337
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.0518
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0310
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0768
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0323
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.0010
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.0100
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2019	anet	Effective Income Tax Rate Reconciliation Uncertain Tax Positionsand Associated Interest Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionsandAssociatedInterestPercent	-0.0995
CY2018	anet	Effective Income Tax Rate Reconciliation Uncertain Tax Positionsand Associated Interest Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionsandAssociatedInterestPercent	0
CY2017	anet	Effective Income Tax Rate Reconciliation Uncertain Tax Positionsand Associated Interest Percent EffectiveIncomeTaxRateReconciliationUncertainTaxPositionsandAssociatedInterestPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.0656
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.2490
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.2586
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	-0.0172
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0.1114
CY2019	anet	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition And Integration Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionAndIntegrationCostsPercent	0.0004
CY2018	anet	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition And Integration Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionAndIntegrationCostsPercent	0.0212
CY2017	anet	Effective Income Tax Rate Reconciliation Nondeductible Expense Acquisition And Integration Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAcquisitionAndIntegrationCostsPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0024
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0053
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.0104
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.0028
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.1361
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.1086
CY2019Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	419911000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	19186000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	8857000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11052000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3950000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	71945000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	77373000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3943000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	614102000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	77900000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	75500000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	110000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	54867000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	57793000	USD
CY2019Q4	anet	Deferred Tax Asset Lease Liability DeferredTaxAssetLeaseLiability	22547000	USD
CY2019Q4	anet	Deferred Tax Assets Capitalized Research And Development DeferredTaxAssetsCapitalizedResearchAndDevelopment	16169000	USD
CY2018Q4	anet	Deferred Tax Assets Capitalized Research And Development DeferredTaxAssetsCapitalizedResearchAndDevelopment	30027000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	15856000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	199374000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	67331000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	56724000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	546771000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	142650000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	326967000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	20038000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	13401000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	5190000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2451000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1320000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	349456000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	19911000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	197315000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	122739000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	452025000	USD
CY2018Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	126492000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	254710000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	3753000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	197315000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	122739000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	67300000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	56700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	74436000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48835000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	26915000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	11171000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	330000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1243000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	22714000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	27413000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	22202000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	89000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	675000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	21000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	12388000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2120000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2173000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1504000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	82000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	706000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	93806000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	74436000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48835000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	93800000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	26800000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	74400000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48800000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	28500000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	35700000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2151369000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	900000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1646186000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39273000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2200000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	75355000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1900000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2410706000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.03
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	5100000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	4600000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	3500000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	552546000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	654415000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	608321000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	595424000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	595726000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	563309000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	519845000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	472489000	USD
CY2019Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	196243000	USD
CY2019Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	237141000	USD
CY2019Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	218130000	USD
CY2019Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	214854000	USD
CY2018Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	220734000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	201726000	USD
CY2018Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	185962000	USD
CY2018Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	169570000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	356303000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	417274000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	390191000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	380570000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	374992000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	361583000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	333883000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	302919000	USD
CY2019Q4	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	110063000	USD
CY2019Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	118732000	USD
CY2019Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	114295000	USD
CY2019Q1	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	119669000	USD
CY2018Q4	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	118439000	USD
CY2018Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	117589000	USD
CY2018Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	104078000	USD
CY2018Q1	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	102362000	USD
CY2019Q4	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	54535000	USD
CY2019Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	55279000	USD
CY2019Q2	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	53040000	USD
CY2019Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	51053000	USD
CY2018Q4	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	50911000	USD
CY2018Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	47903000	USD
CY2018Q2	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	46188000	USD
CY2018Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	42140000	USD
CY2019Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	15716000	USD
CY2019Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	14657000	USD
CY2019Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	16019000	USD
CY2019Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	15506000	USD
CY2018Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	12000000	USD
CY2018Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	15321000	USD
CY2018Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	18420000	USD
CY2018Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	19679000	USD
CY2019Q4	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2019Q3	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2019Q2	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2019Q1	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2018Q4	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2018Q3	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2018Q2	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	405000000	USD
CY2018Q1	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2019Q4	us-gaap	Operating Expenses OperatingExpenses	180314000	USD
CY2019Q3	us-gaap	Operating Expenses OperatingExpenses	188668000	USD
CY2019Q2	us-gaap	Operating Expenses OperatingExpenses	183354000	USD
CY2019Q1	us-gaap	Operating Expenses OperatingExpenses	186228000	USD
CY2018Q4	us-gaap	Operating Expenses OperatingExpenses	181350000	USD
CY2018Q3	us-gaap	Operating Expenses OperatingExpenses	180813000	USD
CY2018Q2	us-gaap	Operating Expenses OperatingExpenses	573686000	USD
CY2018Q1	us-gaap	Operating Expenses OperatingExpenses	164181000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	175989000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	228606000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	206837000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	194342000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	193642000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	180770000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-239803000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	138738000	USD
CY2019Q4	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	0	USD
CY2019Q3	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	0	USD
CY2019Q2	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	0	USD
CY2019Q1	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	0	USD
CY2018Q4	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	661000	USD
CY2018Q3	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	673000	USD
CY2018Q2	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	680000	USD
CY2018Q1	anet	Interest Expense Excluding Related Party InterestExpenseExcludingRelatedParty	687000	USD
CY2019Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11183000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	19169000	USD
CY2019Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	13811000	USD
CY2019Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	12333000	USD
CY2018Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	5509000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	9292000	USD
CY2018Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1489000	USD
CY2018Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4843000	USD
CY2019Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	11183000	USD
CY2019Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	19169000	USD
CY2019Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	13811000	USD
CY2019Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	12333000	USD
CY2018Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	4848000	USD
CY2018Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	8619000	USD
CY2018Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-2169000	USD
CY2018Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	4156000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	187172000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	247775000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	220648000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	206675000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	198490000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	189389000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-241972000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	142894000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-73520000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38880000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31397000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5646000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28168000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20865000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-86703000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1644000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	260692000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	208895000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	189251000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	201029000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	170322000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	168524000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	-155269000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	144538000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.41
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.73
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.47
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.65
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.26
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.25
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.08
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.25
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.33
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.47
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.10
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.08
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.08
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.79

Files In Submission

Name	View Source	Status
0001596532-20-000024-index-headers.html	Edgar Link	pending
0001596532-20-000024-index.html	Edgar Link	pending
0001596532-20-000024.txt	Edgar Link	pending
0001596532-20-000024-xbrl.zip	Edgar Link	pending
anet-20191231.xsd	Edgar Link	pending
anet-20191231_cal.xml	Edgar Link	unprocessable
anet-20191231_def.xml	Edgar Link	unprocessable
anet-20191231_lab.xml	Edgar Link	unprocessable
anet-20191231_pre.xml	Edgar Link	unprocessable
anet20191231-10k.htm	Edgar Link	pending
anet20191231-10k_htm.xml	Edgar Link	completed
aristaswitchingroutingportfo.jpg	Edgar Link	pending
cognitivecloudnetworking1231.jpg	Edgar Link	pending
ex211listofsubsidiarie.htm	Edgar Link	pending
ex231independentaudito.htm	Edgar Link	pending
ex311ceocertificationq.htm	Edgar Link	pending
ex312cfocertificationq.htm	Edgar Link	pending
ex321ceoandcfo906certi.htm	Edgar Link	pending
ex43descriptionofcapit.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
leafspine2a03.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
trg2019a01.jpg	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$ANET
Arista Networks, Inc. Stock $anet

2019 Q4 Form 10-K Financial Statement

#000159653220000024 Filed on February 14, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ANET Arista Networks, Inc. Stock $anet

2019 Q4 Form 10-K Financial Statement

#000159653220000024 Filed on February 14, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ANET
Arista Networks, Inc. Stock $anet