$ADTN
ADTRAN Holdings, Inc. Stock $adtn

$adtn Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000095017021003219 Filed on November 05, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2021 Q2
Revenue	$154.2M	$138.1M	$143.2M
YoY Change	18.47%	3.71%	11.28%
Cost Of Revenue	$99.72M	$90.41M	$80.56M
YoY Change	30.53%	21.87%	7.07%
Gross Profit	$54.44M	$47.67M	$62.67M
YoY Change	1.72%	-19.15%	17.2%
Gross Profit Margin	35.31%	34.53%	43.75%
Selling, General & Admin	$35.07M	$30.97M	$30.87M
YoY Change	20.5%	13.85%	0.22%
% of Gross Profit	64.42%	64.97%	49.25%
Research & Development	$26.51M	$26.76M	$27.87M
YoY Change	4.77%	-1.7%	-2.93%
% of Gross Profit	48.69%	56.13%	44.47%
Depreciation & Amortization	$3.838M	$3.000M	$3.000M
YoY Change	-6.39%	-3.23%	0.0%
% of Gross Profit	7.05%	6.29%	4.79%
Operating Expenses	$61.57M	$57.73M	$58.74M
YoY Change	12.98%	6.07%	-1.3%
Operating Profit	-$7.238M	-$10.06M	$3.931M
YoY Change	117.75%	-321.84%	-165.09%
Interest Expense	$760.0K	$6.000K	$6.000K
YoY Change	-80.51%	-99.81%	-99.94%
% of Operating Profit			0.15%
Other Income/Expense, Net	$1.151M	$648.0K	$26.00K
YoY Change	-227.89%	-138.59%	-101.48%
Pretax Income	-$5.327M	-$9.135M	$6.213M
YoY Change	1675.67%	-251.17%	160.28%
Income Tax	-$1.137M	$1.292M	$1.127M
% Of Pretax Income			18.14%
Net Earnings	-$4.190M	-$10.43M	$5.086M
YoY Change	-168.53%	-290.24%	576.33%
Net Earnings / Revenue	-2.72%	-7.55%	3.55%
Basic Earnings Per Share	-$0.09	-$0.21	$0.10
Diluted Earnings Per Share	-$0.09	-$0.21	$0.10
COMMON SHARES
Basic Shares Outstanding	48.68M	48.61M	48.45M
Diluted Shares Outstanding		48.61M	49.43M

Balance Sheet

Concept	2021 Q4	2021 Q3	2021 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$56.95M	$76.71M	$71.35M
YoY Change	-8.04%	-0.76%	-8.65%
Cash & Equivalents	$56.60M	$75.50M	$69.93M
Short-Term Investments	$350.0K	$1.210M	$1.418M
Other Short-Term Assets	$9.511M	$10.16M	$9.884M
YoY Change	14.59%	16.82%	6.28%
Inventory	$139.9M	$127.2M	$119.0M
Prepaid Expenses
Receivables	$158.7M	$124.1M	$122.7M
Other Receivables	$11.23M	$9.867M	$20.19M
Total Short-Term Assets	$376.3M	$349.5M	$344.5M
YoY Change	18.56%	6.14%	9.4%
LONG-TERM ASSETS
Property, Plant & Equipment	$55.77M	$56.56M	$58.27M
YoY Change	-10.63%	-12.12%	-10.62%
Goodwill	$6.968M	$6.968M	$6.968M
YoY Change	0.0%
Intangibles	$19.29M	$20.29M	$21.35M
YoY Change	-17.8%
Long-Term Investments	$70.62M	$83.94M	$82.78M
YoY Change	-11.84%	7.61%	-1.92%
Other Assets	$30.97M	$31.68M	$28.39M
YoY Change	21.81%	38.93%	43.4%
Total Long-Term Assets	$192.7M	$208.4M	$206.9M
YoY Change	-7.48%	3.11%	-0.42%
TOTAL ASSETS
Total Short-Term Assets	$376.3M	$349.5M	$344.5M
Total Long-Term Assets	$192.7M	$208.4M	$206.9M
Total Assets	$569.0M	$557.9M	$551.4M
YoY Change	8.24%	4.99%	5.5%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$102.5M	$79.07M	$66.50M
YoY Change	105.27%	32.01%	6.4%
Accrued Expenses	$28.57M	$32.66M	$31.34M
YoY Change	-1.13%	7.44%	4.11%
Deferred Revenue	$17.74M	$16.39M	$15.89M
YoY Change	25.87%		31.42%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$155.4M	$134.0M	$116.1M
YoY Change	64.94%	25.27%	8.27%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$4.500M	$7.365M	$59.84M
YoY Change	-36.83%	-86.56%	16.65%
Total Long-Term Liabilities	$4.500M	$7.365M	$59.84M
YoY Change	-36.83%	-86.56%	16.65%
TOTAL LIABILITIES
Total Short-Term Liabilities	$155.4M	$134.0M	$116.1M
Total Long-Term Liabilities	$4.500M	$7.365M	$59.84M
Total Liabilities	$211.9M	$194.2M	$175.9M
YoY Change	38.75%	20.0%	10.98%
SHAREHOLDERS EQUITY
Retained Earnings	$740.8M	$760.4M
YoY Change	-5.24%
Common Stock	$289.7M	$287.7M
YoY Change	2.65%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$661.5M	$669.9M
YoY Change	-2.64%
Treasury Stock Shares	$30.59M	$30.97M
Shareholders Equity	$357.1M	$363.8M	$375.5M
YoY Change
Total Liabilities & Shareholders Equity	$569.0M	$557.9M	$551.4M
YoY Change	8.24%	4.99%	5.5%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2021 Q2
OPERATING ACTIVITIES
Net Income	-$4.190M	-$10.43M	$5.086M
YoY Change	-168.53%	-290.24%	576.33%
Depreciation, Depletion And Amortization	$3.838M	$3.000M	$3.000M
YoY Change	-6.39%	-3.23%	0.0%
Cash From Operating Activities	-$25.88M	$10.68M	$7.513M
YoY Change	131.1%	-252.54%	341.94%
INVESTING ACTIVITIES
Capital Expenditures	-$2.097M	-$1.362M	-$1.510M
YoY Change	61.31%	-31.9%	-11.18%
Acquisitions
YoY Change
Other Investing Activities	$15.98M	-$524.0K	$1.776M
YoY Change	232.98%	-104.33%	-6.53%
Cash From Investing Activities	$13.89M	-$1.886M	$266.0K
YoY Change	296.74%	-118.67%	33.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-5.832M	-1.830M	-2.096M
YoY Change	8.0%	-57.44%	-52.36%
NET CHANGE
Cash From Operating Activities	-25.88M	10.68M	7.513M
Cash From Investing Activities	13.89M	-1.886M	266.0K
Cash From Financing Activities	-5.832M	-1.830M	-2.096M
Net Change In Cash	-17.83M	6.962M	5.683M
YoY Change	36.1%	-680.17%	-327.32%
FREE CASH FLOW
Cash From Operating Activities	-$25.88M	$10.68M	$7.513M
Capital Expenditures	-$2.097M	-$1.362M	-$1.510M
Free Cash Flow	-$23.79M	$12.04M	$9.023M
YoY Change	140.26%	-340.8%	165.38%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
	dei	Entity Registrant Name EntityRegistrantName	ADTRAN, Inc.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
	dei	Entity Central Index Key EntityCentralIndexKey	0000926282
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-24612
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	63-0918200
	dei	Entity Address Address Line1 EntityAddressAddressLine1	901 Explorer Boulevard
	dei	Entity Address City Or Town EntityAddressCityOrTown	Huntsville
	dei	Entity Address State Or Province EntityAddressStateOrProvince	AL
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	35806-2807
	dei	City Area Code CityAreaCode	256
	dei	Local Phone Number LocalPhoneNumber	963-8000
	dei	Security12b Title Security12bTitle	Common Stock, Par Value $0.01 per share
	dei	Trading Symbol TradingSymbol	ADTN
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.141
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.368
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48679989
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	75503000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	60161000
CY2021Q3	us-gaap	Restricted Cash Current RestrictedCashCurrent	102000
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	18000
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	1210000
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	1731000
CY2021Q3	us-gaap	Short Term Investments ShortTermInvestments	2610000
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	3131000
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	0
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	38000
CY2021Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	124146000
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	98827000
CY2021Q3	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	9867000
CY2020Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	21531000
CY2021Q3	us-gaap	Inventory Net InventoryNet	127241000
CY2020Q4	us-gaap	Inventory Net InventoryNet	125457000
CY2021Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	10061000
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	8293000
CY2021Q3	us-gaap	Assets Current AssetsCurrent	349530000
CY2020Q4	us-gaap	Assets Current AssetsCurrent	317418000
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	56556000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	62399000
CY2021Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	8957000
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	9869000
CY2021Q3	us-gaap	Goodwill Goodwill	6968000
CY2020Q4	us-gaap	Goodwill Goodwill	6968000
CY2021Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	20291000
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	23470000
CY2021Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	31675000
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	25425000
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	44305000
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	43385000
CY2021Q3	us-gaap	Long Term Investments LongTermInvestments	83935000
CY2020Q4	us-gaap	Long Term Investments LongTermInvestments	80130000
CY2021Q3	us-gaap	Assets Assets	557912000
CY2020Q4	us-gaap	Assets Assets	525679000
CY2021Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	79074000
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	49929000
CY2021Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	16394000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408846000
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	14092000
CY2021Q3	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	15392000
CY2020Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	13609000
CY2021Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	17270000
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	15262000
CY2021Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	5914000
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	1301000
CY2021Q3	us-gaap	Liabilities Current LiabilitiesCurrent	134044000
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	94193000
CY2021Q3	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	7426000
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	6888000
CY2021Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	16988000
CY2020Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	18664000
CY2021Q3	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	28336000
CY2020Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	25866000
CY2021Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	7365000
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	7124000
CY2021Q3	us-gaap	Liabilities Liabilities	194159000
CY2020Q4	us-gaap	Liabilities Liabilities	152735000
CY2021Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000
CY2021Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	79652000
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48680000
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	79652000
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48241000
CY2021Q3	us-gaap	Common Stock Value CommonStockValue	797000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	797000
CY2021Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	286923000
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	281466000
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-14466000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11639000
CY2021Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	760398000
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	781813000
CY2021Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	30973000
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	31280000
CY2021Q3	us-gaap	Treasury Stock Value TreasuryStockValue	669899000
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	679493000
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	363753000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	372944000
CY2021Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	557912000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	525679000
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	138081000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4328000
CY2020Q3	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-12000
	us-gaap	Gross Profit GrossProfit	164034000
CY2021Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	30972000
CY2020Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	27205000
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	89273000
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	84624000
CY2021Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	26759000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
CY2021Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	90408000
CY2020Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	74181000
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	244904000
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	212347000
CY2021Q3	us-gaap	Gross Profit GrossProfit	47673000
CY2020Q3	us-gaap	Gross Profit GrossProfit	58962000
	us-gaap	Gross Profit GrossProfit	163942000
CY2020Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	27223000
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	82131000
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	85794000
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	65000
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-10058000
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	4534000
	us-gaap	Operating Income Loss OperatingIncomeLoss	-7462000
	us-gaap	Operating Income Loss OperatingIncomeLoss	-6449000
CY2021Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	344000
CY2020Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	344000
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	887000
	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	1031000
CY2021Q3	us-gaap	Interest Expense InterestExpense	6000
	us-gaap	Interest Expense InterestExpense	18000
	us-gaap	Interest Expense InterestExpense	1000
CY2021Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	-63000
CY2020Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	2844000
	us-gaap	Gain Loss On Investments GainLossOnInvestments	2942000
	us-gaap	Gain Loss On Investments GainLossOnInvestments	1819000
CY2021Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	648000
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1679000
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2673000
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2307000
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-9135000
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	6043000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-978000
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-5907000
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1292000
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	562000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3467000
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2171000
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-10427000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5481000
	us-gaap	Net Income Loss NetIncomeLoss	-4445000
	us-gaap	Net Income Loss NetIncomeLoss	-3736000
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48609000
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47957000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48470000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47957000
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48609000
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48424000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48470000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47957000
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.21
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.09
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.21
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.09
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-10427000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5481000
	us-gaap	Net Income Loss NetIncomeLoss	-4445000
	us-gaap	Net Income Loss NetIncomeLoss	-3736000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-61000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-45000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-348000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	445000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-124000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-244000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-435000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-576000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1389000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2469000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-2914000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2718000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1326000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2668000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2827000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3739000
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-11753000
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8149000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-7272000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	372944000
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	896000
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1956000
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4361000
CY2021Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4374000
CY2021Q2	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-128000
CY2021Q2	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	12000
CY2021Q2	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	3000
CY2021Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2308000
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1808000
CY2021Q1	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-68000
CY2021Q1	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	50000
CY2021Q1	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	81000
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1244000
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1807000
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	370375000
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	5086000
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	455000
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	375515000
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-10427000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1326000
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2021Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4389000
CY2021Q3	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	2000
CY2021Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	12000
CY2021Q3	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	11000
CY2021Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2559000
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1842000
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	363753000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	380426000
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-9969000
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1392000
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4328000
CY2020Q1	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-32000
CY2020Q1	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2758000
CY2020Q1	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	23000
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1791000
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	363715000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	752000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2463000
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4337000
CY2020Q2	adtn	Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes UnvestedRestrictedStockUnitsDividendsAccrualAdjustmentForMarketChanges	-28000
CY2020Q2	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	24000
CY2020Q2	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	2000
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1655000
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	364194000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5481000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2668000
CY2020Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	12000
CY2020Q3	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	8000
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1610000
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	369593000
	us-gaap	Profit Loss ProfitLoss	-4445000
	us-gaap	Profit Loss ProfitLoss	-3736000
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12246000
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12525000
	adtn	Gain Loss On Investments And Dividends GainLossOnInvestmentsAndDividends	3320000
	adtn	Gain Loss On Investments And Dividends GainLossOnInvestmentsAndDividends	1819000
	us-gaap	Share Based Compensation ShareBasedCompensation	5457000
	us-gaap	Share Based Compensation ShareBasedCompensation	5056000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	437000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-89000
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-195000
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	65000
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	26346000
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	9131000
	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	-11152000
	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	6224000
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2669000
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21170000
	adtn	Increase Decrease In Prepaid Expense Other Current Assets And Other Assets IncreaseDecreaseInPrepaidExpenseOtherCurrentAssetsAndOtherAssets	8514000
	adtn	Increase Decrease In Prepaid Expense Other Current Assets And Other Assets IncreaseDecreaseInPrepaidExpenseOtherCurrentAssetsAndOtherAssets	672000
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	29614000
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	14204000
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	10392000
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	5618000
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4798000
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-227000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	28891000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-5317000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3572000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5082000
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	28305000
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	86145000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	28853000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	42641000
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	523000
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	500000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3620000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	37899000
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6111000
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	113000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	13124000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12993000
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	24600000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-7126000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-37593000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	18145000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-5011000
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-2719000
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2641000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	60179000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	73773000
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	75605000
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	71403000
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1833000
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	231000
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	100000
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	442000
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.093
	us-gaap	Use Of Estimates UseOfEstimates	<p style="text-indent:0.0%;font-size:10.0pt;margin-top:10.0pt;line-height:1.3;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:bold;font-size:10.0pt;font-family:Times New Roman;">Use of Estimates</span></p><p style="text-indent:0.0%;font-size:10.0pt;margin-top:10.0pt;line-height:1.3;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:normal;font-size:10.0pt;font-family:Times New Roman;">The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. The more significant estimates include excess and obsolete inventory reserves, warranty reserves, customer rebates, determination and accrual of deferred revenue components of multi-element sales agreements, estimated costs to complete obligations associated with deferred and accrued revenues and network installations, estimated income tax provision and income tax contingencies, fair value of stock-based compensation, assessment of goodwill and other intangibles for impairment, estimated lives of intangible assets, estimated pension liability and fair value of investments. Actual amounts could differ significantly from these estimates.</span></p><p style="text-indent:0.0%;font-size:10.0pt;margin-top:10.0pt;line-height:1.3;font-family:Times New Roman;margin-bottom:0.0pt;text-align:justify;"><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:normal;font-size:10.0pt;font-family:Times New Roman;">We assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to us and the unknown future impacts of the SARS-CoV-2 coronavirus/COVID-19 global pandemic (or variants of the SARS-CoV-2 coronavirus, including the Delta variant) as well as supply chain constraints as of September 30, 2021</span><span style="background-color:rgba(0,0,0,0);color:rgba(0,0,0,1);white-space:pre-wrap;font-weight:normal;font-size:10.0pt;font-family:Times New Roman;"> and through the date of this report. The accounting matters assessed included, but were not limited to, the allowance for expected credit losses, stock-based compensation, carrying value of goodwill, intangibles and other long-lived assets, financial assets, valuation allowances for tax assets, revenue recognition and costs of revenue. Future conditions related to the magnitude and duration of the COVID-19 pandemic, as well as other factors, including supply chain constraints, could result in further impacts to our consolidated financial statements in future reporting periods.</span></p>
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	75503000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	60161000
CY2021Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	102000
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	18000
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75605000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	60179000
	adtn	Number Of Product Categories NumberOfProductCategories	3
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	138081000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408846000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.64
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2021Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	124146000
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	98827000
CY2021Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	999000
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	63000
CY2021Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	16394000
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	14092000
CY2021Q3	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	7426000
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	6888000
CY2021Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	2000000.0
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	9800000
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	3.545
	adtn	Income Tax Expense Benefit Result Of Cares Act Of2020 IncomeTaxExpenseBenefitResultOfCARESActOf2020	-7800000
CY2021Q1	adtn	Income Tax Expense Benefit Result Of Alabama Business Tax Competitiveness Act IncomeTaxExpenseBenefitResultOfAlabamaBusinessTaxCompetitivenessAct	1600000
CY2021Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	59200000
CY2021Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	50200000
CY2021Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	9000000.0
CY2021Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	59189000
CY2021Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	50232000
CY2021Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	8957000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	55687000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	45818000
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	9869000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1078000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1487000
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	17025000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4000
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	102000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	165000
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	27000
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	578000
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18178000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1078000
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18200000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1100000
CY2021Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	18100000
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1000000.0
CY2021Q3	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	300000
CY2020Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	300000
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1842000
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1610000
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5457000
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5056000
CY2021Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	460000
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	384000
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1343000
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1205000
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1382000
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1226000
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	4114000
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3851000
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	139000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1846000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	11.49
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	359000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	16.75
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	21000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	13.00
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	65000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	11.93
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	2119000
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	12.40
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	4000000.0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2718000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.17
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y10M24D
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	363000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	16.81
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1411000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	607000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	28.93
	adtn	Share Based Compensation Arrangement By Share Based Payment Award Options Expired In Period Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpiredInPeriodIntrinsicValue	18000
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1748000
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	19.37
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y8M12D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2060000
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1748000
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	19.37
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y8M12D
CY2021Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	2060000
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2100000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1400000
CY2021Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	45416000
CY2020Q3	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	623000
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	40000
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	45515000
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	44666000
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	457000
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	7000
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	45116000
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	22000
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	70000
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	206000
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	303000
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	17000
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	6000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	53000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	45000
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	5000
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	64000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	153000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	258000
CY2021Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
	us-gaap	Debt Securities Available For Sale Purchased With Credit Deterioration Amount At Purchase Price DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice	0
CY2019Q1	us-gaap	Transfer Of Investments TransferOfInvestments	3400000
CY2021Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	800000
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	800000
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-55000
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-1485000
CY2021Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-68000
CY2020Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	2157000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	2844000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3046000
CY2020Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2780000
CY2020Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	35142000
CY2021Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-68000
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2789000
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	1561000
CY2021Q3	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	66777000
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	47026000
CY2021Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	1202000
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	776000
CY2021Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	59262000
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	77655000
CY2021Q3	us-gaap	Inventory Net InventoryNet	127241000
CY2020Q4	us-gaap	Inventory Net InventoryNet	125457000
CY2021Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	44300000
CY2020Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	39600000
CY2021Q3	us-gaap	Land Land	4575000
CY2020Q4	us-gaap	Land Land	4575000
CY2021Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	34995000
CY2021Q3	adtn	Building Building	68156000
CY2020Q4	adtn	Building Building	68169000
CY2021Q3	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	19925000
CY2020Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	19965000
CY2021Q3	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	71615000
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	70942000
CY2021Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	134689000
CY2020Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	132920000
CY2021Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	333955000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	331713000
CY2021Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	277399000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	269314000
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	56556000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	62399000
CY2021Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
CY2020Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
CY2021Q3	us-gaap	Depreciation Depreciation	3000000.0
CY2020Q3	us-gaap	Depreciation Depreciation	3100000
	us-gaap	Depreciation Depreciation	9100000
	us-gaap	Depreciation Depreciation	9100000
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7000000.0
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7000000.0
CY2021Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2021Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	36246000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15955000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	20291000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	39293000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15823000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23470000
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
CY2021Q3	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	984000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	3479000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	3327000
CY2020Q3	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000.0
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000.0
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3100000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3400000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3233000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3027000
CY2021Q3	adtn	Finite Lived Intangible Assets Amortization Expense After Year Four FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour	6241000
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	20291000
CY2021Q3	adtn	Sales Type Lease Lease Receivable Current SalesTypeLeaseLeaseReceivableCurrent	129000
CY2020Q4	adtn	Sales Type Lease Lease Receivable Current SalesTypeLeaseLeaseReceivableCurrent	702000
CY2021Q3	adtn	Sales Type Lease Lease Receivable Noncurrent SalesTypeLeaseLeaseReceivableNoncurrent	7000
CY2020Q4	adtn	Sales Type Lease Lease Receivable Noncurrent SalesTypeLeaseLeaseReceivableNoncurrent	347000
CY2021Q3	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	136000
CY2020Q4	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	1049000
CY2021Q3	adtn	Sales Type Leases Unearned Revenue Current SalesTypeLeasesUnearnedRevenueCurrent	98000
CY2020Q4	adtn	Sales Type Leases Unearned Revenue Current SalesTypeLeasesUnearnedRevenueCurrent	218000
CY2021Q3	adtn	Sales Type Leases Unearned Revenue Noncurrent SalesTypeLeasesUnearnedRevenueNoncurrent	1000
CY2020Q4	adtn	Sales Type Leases Unearned Revenue Noncurrent SalesTypeLeasesUnearnedRevenueNoncurrent	50000
CY2021Q3	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	37000
CY2020Q4	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	781000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2469000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-1289000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	37000
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0
CY2021Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	2500000
CY2021Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	5000000.0
CY2021Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-1418000
CY2021Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-92000
CY2021Q3	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	-1326000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	2963000
CY2020Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	295000
CY2020Q3	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	2668000
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-3272000
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-445000
	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	-2827000
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	3162000
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-577000
	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	3739000
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-38000
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-9000
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-29000
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	668000
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	174000
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	494000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	42000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	10000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	32000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	728000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	189000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	539000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	180000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	56000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	124000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	354000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	110000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	244000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-1389000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1389000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	2469000
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1326000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	2763000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	95000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2668000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-471000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-113000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-358000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	600000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	156000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	444000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-13000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-3000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-10000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-1000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	630000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	195000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	435000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	835000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	259000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	576000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-2914000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-2914000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	2718000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2718000
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-2742000
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	85000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2827000
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	4154000
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	415000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3739000
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	-10427000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5481000
	us-gaap	Net Income Loss NetIncomeLoss	-4445000
	us-gaap	Net Income Loss NetIncomeLoss	-3736000
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48609000
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47957000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48470000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47957000
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	467000
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48609000
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48424000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48470000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47957000
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.21
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.09
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4300000
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	138081000
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.21
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.09
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	200000
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3400000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408846000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
CY2021Q3	us-gaap	Gross Profit GrossProfit	47673000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
CY2020Q3	us-gaap	Gross Profit GrossProfit	58962000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408846000
	us-gaap	Gross Profit GrossProfit	163942000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
	us-gaap	Gross Profit GrossProfit	164034000
	adtn	Number Of Product Categories NumberOfProductCategories	3
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	138081000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	138081000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408846000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
	us-gaap	Standard Product Warranty Description StandardProductWarrantyDescription	90 days to five years
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5600000
CY2020Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7100000
CY2021Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5997000
CY2020Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7294000
CY2020Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7146000
CY2019Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8394000
CY2021Q3	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	472000
CY2020Q3	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	632000
	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	253000
	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	970000
CY2021Q3	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	822000
CY2020Q3	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	734000
	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	1752000
	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	2172000
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5647000
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7192000
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	5647000
	us-gaap	Restructuring Costs RestructuringCosts	12500000
CY2021Q2	us-gaap	Restructuring Reserve RestructuringReserve	1521000
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	4186000
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	1903000
	us-gaap	Restructuring Charges RestructuringCharges	309000
	us-gaap	Restructuring Charges RestructuringCharges	3648000
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	1903000
	us-gaap	Restructuring Charges RestructuringCharges	309000
	us-gaap	Restructuring Charges RestructuringCharges	3648000
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7192000
CY2021Q3	adtn	Commitments Related To Performance Bonds CommitmentsRelatedToPerformanceBonds	20900000
CY2020Q4	adtn	Commitments Related To Performance Bonds CommitmentsRelatedToPerformanceBonds	15200000
	adtn	Commitments Related To Performance Bonds Expiration Month And Year CommitmentsRelatedToPerformanceBondsExpirationMonthAndYear	2024-08
CY2021Q3	adtn	Letter Of Credit Secured By Pledge Of Portion Of Fixed Income Securities LetterOfCreditSecuredByPledgeOfPortionOfFixedIncomeSecurities	18400000
CY2021Q3	adtn	Commitments Towards Private Equity Funds CommitmentsTowardsPrivateEquityFunds	4900000
	us-gaap	Restructuring Charges RestructuringCharges	309000
CY2021Q3	us-gaap	Payments For Restructuring PaymentsForRestructuring	42000
	us-gaap	Payments For Restructuring PaymentsForRestructuring	3016000
CY2021Q3	us-gaap	Restructuring Reserve RestructuringReserve	1479000
CY2021Q3	us-gaap	Restructuring Reserve RestructuringReserve	1479000
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	1568000
CY2020	us-gaap	Restructuring Charges RestructuringCharges	6229000
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	3611000
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	4186000

Files In Submission

Name	View Source	Status
0000950170-21-003219-index-headers.html	Edgar Link	pending
0000950170-21-003219-index.html	Edgar Link	pending
0000950170-21-003219.txt	Edgar Link	pending
0000950170-21-003219-xbrl.zip	Edgar Link	pending
adtn-20210930.htm	Edgar Link	pending
adtn-20210930.xsd	Edgar Link	pending
adtn-20210930_cal.xml	Edgar Link	unprocessable
adtn-20210930_def.xml	Edgar Link	unprocessable
adtn-20210930_htm.xml	Edgar Link	completed
adtn-20210930_lab.xml	Edgar Link	unprocessable
adtn-20210930_pre.xml	Edgar Link	unprocessable
adtn-ex10_1.htm	Edgar Link	pending
adtn-ex31.htm	Edgar Link	pending
adtn-ex32.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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report.css	Edgar Link	pending
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$ADTN
ADTRAN Holdings, Inc. Stock $adtn

2021 Q4 Form 10-Q Financial Statement

#000095017021003219 Filed on November 05, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ADTN ADTRAN Holdings, Inc. Stock $adtn

2021 Q4 Form 10-Q Financial Statement

#000095017021003219 Filed on November 05, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ADTN
ADTRAN Holdings, Inc. Stock $adtn