75000 - Document - Document and Entity Information
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75010 - Statement - Condensed Consolidated Balance Sheets (Unaudited)
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75020 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)
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75030 - Statement - Condensed Consolidated Statements of Loss (Unaudited)
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75040 - Statement - Condensed Consolidated Statements of Loss (Unaudited) (Parenthetical)
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75050 - Statement - Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited)
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75060 - Statement - Condensed Consolidated Statements of Changes in Equity (Unaudited)
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75070 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)
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995455 - Disclosure - Summary of Significant Accounting Policies
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995465 - Disclosure - Revenue and Receivables
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995475 - Disclosure - Income Taxes
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995485 - Disclosure - Stock-Based Compensation
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995495 - Disclosure - Investments
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995505 - Disclosure - Inventory
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995525 - Disclosure - Goodwill
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995555 - Disclosure - Convertible Senior Notes and Capped Calls
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995575 - Disclosure - Equity
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995585 - Disclosure - Redeemable Non-controlling Interest
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995595 - Disclosure - Loss per Share
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995605 - Disclosure - Segment Information
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995615 - Disclosure - Commitments and Contingencies
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995625 - Disclosure - Subsequent Events
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995635 - Disclosure - Summary of Significant Accounting Policies (Policies)
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995645 - Disclosure - Revenue and Receivables (Tables)
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995655 - Disclosure - Stock-Based Compensation (Tables)
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995665 - Disclosure - Investments (Tables)
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995675 - Disclosure - Inventory (Tables)
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995685 - Disclosure - Property, Plant and Equipment (Tables)
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995695 - Disclosure - Goodwill (Tables)
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995725 - Disclosure - Convertible Senior Notes and Capped Calls (Tables)
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995735 - Disclosure - Employee Benefit Plans (Tables)
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995745 - Disclosure - Equity (Tables)
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995755 - Disclosure - Redeemable Non-controlling Interest (Tables)
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995765 - Disclosure - Loss Per Share (Tables)
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995775 - Disclosure - Segment Information (Tables)
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995785 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)
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995795 - Disclosure - Revenue and Receivables - Additional Information (Detail)
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995805 - Disclosure - Revenue and Receivables - Additional Information (Detail1)
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995805 - Disclosure - Revenue and Receivables - Additional Information (Detail1) [Default]
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995815 - Disclosure - Revenue and Receivables - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail)
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995825 - Disclosure - Revenue and Receivables - Information about Receivable, Contract Assets, and Unearned Revenue from Contracts with Customers (Detail)
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995835 - Disclosure - Income Taxes - Additional Information (Detail)
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995845 - Disclosure - Stock-Based Compensation (Stock Incentive Plans and Stock Options) - Additional Information (Detail)
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995855 - Disclosure - Stock-Based Compensation - Summary of PSUs, RSUs and Restricted Stock (Detail)
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995865 - Disclosure - Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail)
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995875 - Disclosure - Investments - Cash Equivalents and Investments held at Fair Value (Detail)
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995885 - Disclosure - Investments - Cash Equivalents and Investments held at Fair Value (Parenthetical) (Detail)
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995895 - Disclosure - Inventory - Components in Inventory, net (Detail)
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995905 - Disclosure - Property, Plant and Equipment - Property, Plant and Equipment (Detail)
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995915 - Disclosure - Property, Plant and Equipment - Additional Information (Detail)
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995925 - Disclosure - Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail)
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995935 - Disclosure - Goodwill - Additional Information (Detail)
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995945 - Disclosure - Intangible Assets - Summary of Intangible Assets, Net (Detail)
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995955 - Disclosure - Intangible Assets - Additional Information (Detail)
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995965 - Disclosure - Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail)
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995975 - Disclosure - Credit Agreements - Carrying Amount of Revolving Agreements (Detail)
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995985 - Disclosure - Credit Agreements - Additional Information (Detail)
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995995 - Disclosure - Convertible Senior Notes and Capped Calls - Outstanding Principal and Carrying Value of Convertible Senior Notes (Detail)
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996005 - Disclosure - Convertible Senior Notes and Capped Calls - Additional Information (Detail)
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996015 - Disclosure - Convertible Senior Notes and Capped Calls - Interest Expense for 2030 Notes (Detail)
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996025 - Disclosure - Employee Benefit Plans - Summary of Net Amounts Recognized in Consolidated Balance Sheets for the Unfunded Pension Liability (Detail)
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996035 - Disclosure - Employee Benefit Plans - Schedule of the Components of Net Periodic Pension Cost (Detail)
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996045 - Disclosure - Employee Benefit Plans - Additional Information (Detail)
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996055 - Disclosure - Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax, by Component (Detail)
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996065 - Disclosure - Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail)
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996075 - Disclosure - Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail)
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996085 - Disclosure - Redeemable Non-controlling Interest - Summary of Redeemable Non-controlling Interest Activity (Detail)
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996095 - Disclosure - Redeemable Non-controlling Interest - Additional Information (Detail)
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996105 - Disclosure - Loss Per Share - Summary of Calculation of Basic and Diluted Loss Per Share (Detail)
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996115 - Disclosure - Loss Per Share - Schedule of Antidilutive Securities Excluded from Earnings Per Share Computation (Details)
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996125 - Disclosure - Segment Information - Additional Information (Detail)
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996135 - Disclosure - Segment Information - Revenue and Gross Profit of Reportable Segments (Detail)
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996145 - Disclosure - Segment Information - Revenue Information by Geographic Area (Detail)
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996155 - Disclosure - Commitments and Contingencies - Additional Information (Detail)
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996165 - Disclosure - Subsequent Events - Additional Information (Detail)
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Payments for Repurchase of Redeemable Noncontrolling Interest
Redemption of redeemable non-controlling interest
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Weighted Avg. Grant Date Fair Value, PSUs, RSUs and restricted stock vested
Retirement Plan Type [Axis]
Segments [Domain]
Segments
Liability, Defined Benefit Pension Plan, Current
Current pension liability
Current pension liability
Gain (loss) on redemption of redeemable non-controlling interest.
Gain (Loss) On Redemption Of Redeemable Non-Controlling Interest
Gain on redemption of redeemable non-controlling interest
Effect of redemption of RNCI
Redeemable Noncontrolling Interest [TextBlock]
Redeemable Noncontrolling Interest [TextBlock]
Redeemable Non-controlling Interest
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Statement of Financial Position Location, Balance [Domain]
Balance Sheet Location
Capitalized Computer Software, Gross
Computer hardware and software
Contributions to defined benefit pension plans
Defined Benefit Plan, Plan Assets, Contributions by Employer
Increase (Decrease) in Accounts Payable, Total
Increase (Decrease) in Accounts Payable
Accounts payable
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Supplemental disclosure of non-cash investing and financing activities:
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Mortgage/Agency-Backed Bonds [Member]
Long-Term Debt, Excluding Current Maturities
Non-current convertible senior notes
Goodwill disclosure.
Goodwill Disclosure [Abstract]
Equity [Abstract]
Entity Current Reporting Status
Entity Current Reporting Status
Municipal Bonds [Member]
Municipal Fixed-Rate Bonds [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Significant Other Observable Inputs (Level 2) [Member]
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies
Common Stock, Shares Authorized
Common stock, shares authorized
Finite-Lived Intangible Asset, Expected Amortization, Year Four
2030
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit
Product and Service [Axis]
Product and Service
Document Fiscal Period Focus
Document Fiscal Period Focus
Debt Instrument, Interest Rate, Stated Percentage
Debt instrument, interest rate, stated percentage
Revenue from Contract with Customer [Abstract]
Entity Shell Company
Entity Shell Company
Cash and Cash Equivalents, at Carrying Value, Ending Balance
Cash and Cash Equivalents, at Carrying Value, Beginning Balance
Cash and Cash Equivalents, at Carrying Value, Total
Cash and Cash Equivalent
Cash and cash equivalents
Goodwill Disclosure [Text Block]
Goodwill
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount
Balance at beginning of period
Balance at end of period
Common Stock, Shares, Issued, Total
Common Stock, Shares, Issued
Ending Balance, Shares
Beginning Balance, Shares
Common stock, shares issued
Statement [Table]
Statement [Table]
Deferred compensation adjustments, net of tax
Deferred Compensation Adjustments Net Of Tax
Deferred compensation adjustments net of tax.
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Right-of-use assets obtained in exchange for lease obligations
Convertible Senior Notes [Member]
Convertible senior notes.
Convertible Senior Notes [Member]
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Summary of Net Amounts Recognized in Consolidated Balance Sheets for the Unfunded Pension Liability
Defined Benefit Pension Plan Asset Noncurrent
Defined Benefit Pension Plan Asset Noncurrent.
Non-current pension asset
Net proceeds
Proceeds from Debt, Net of Issuance Costs
Cash used In Operating Activities Related To Operating leases
Cash used In Operating Activities Related To Operating leases
Cash used in operating activities related to operating leases
Statement [Line Items]
Statement [Line Items]
Business Combination [Domain]
Entity Filer Category
Entity Filer Category
Liabilities and Equity
Total Liabilities, Redeemable Non-Controlling Interest and Equity
Total liabilities, non-controlling interest and equity
Debt Instrument [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net (loss) gain, Net-of-Tax Amount
Trade Name [Member]
Trade Names [Member]
Trade Names [Member]
Cash and Cash Equivalents, Fair Value Disclosure
Cash equivalents
Deferred Tax Assets, Valuation Allowance, Total
Deferred Tax Assets, Valuation Allowance
Valuation allowance established against deferred tax assets
Valuation Allowance
Subsequent Event [Line Items]
Goodwill, Ending balance
Goodwill, Beginning balance
Goodwill, Total
Goodwill
Goodwill
Other, net
Other Noncash Income (Expense), Total
Other Noncash Income (Expense)
Effective Income Tax Rate Reconciliation, Percent, Total
Effective Income Tax Rate Reconciliation, Percent
Effective tax rate expense (benefit)
Effective tax rate expense (benefit)
Redemption Of Redeemable Non-controlling Interest
Redemption of redeemable non-controlling interest.
Redemption of redeemable non-controlling interest
Stock Options [Member]
Accrued wages and benefits [Member]
Employee Related Liabilities Current [Member]
Employee related liabilities current.
Geographical [Domain]
Geographical
Purchases of intangibles - developed technology
Payments to Acquire Intangible Assets
Intangibles - internally developed technology
Asset-Backed Securities [Member]
Asset-Backed Bonds [Member]
Redeemable Noncontrolling Interest, Equity, Common, Redemption Value
Redemption of redeemable non-controlling interest
Other Comprehensive Income (Loss), before Tax, Total
Other Comprehensive Income (Loss), before Tax
Total Other Comprehensive (Loss) Income, Before-Tax Amount
Schedule of Inventory, Current [Table Text Block]
Components in Inventory, net
Additional Paid in Capital, Common Stock, Ending Balance
Additional Paid in Capital, Common Stock, Beginning Balance
Additional Paid in Capital, Common Stock
Additional paid-in capital
Additional Paid-in Capital
Debt Instrument, Interest Rate During Period
Percentage of floor rate
Access & Aggregation Solutions
Access & Aggregation Solutions [Member]
Access & aggregation solutions.
Significant Accounting Policies [Text Block]
Summary of Significant Accounting Policies
Percentage of guaranteed interest rate plus a variable component.
Percentage Of Guaranteed Interest Rate Plus Variable Component
Percentage of guaranteed interest rate plus a variable component
Weighted Average Useful Life (in years)
Finite-Lived Intangible Asset, Useful Life
Disaggregation of Revenue [Table]
Disaggregation Of Revenue [Table]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Summary of Calculation of Basic and Diluted Loss Per Share
Recent accounting pronouncements not yet adopted.
Recent Accounting Pronouncements Not Yet Adopted Policy [Text Block]
Recent Accounting Pronouncements Not Yet Adopted
Furniture and Fixtures, Gross
Furniture and fixtures
Increase (Decrease) in Other Receivables
Other receivables
Investment, Name [Axis]
Non-current lease obligations
Non-current Lease Obligations
Non-current lease obligations.
Loss per common share attributable to ADTRAN Holdings, Inc. - basic
Loss per share attributable to ADTRAN Holdings, Inc. - basic
Earnings Per Share, Basic, Total
Earnings Per Share, Basic
Disaggregation of Revenue [Table Text Block]
Disaggregate of Revenue by Reportable Segment and Revenue Category
Employee Benefit Plans
Retirement Benefits [Text Block]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax, Total
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net (loss) gain, Before-Tax Amount
James D. Wilson, Jr [Member]
James D. Wilson, Jr
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Foreign currency translation adjustment, Net-of-Tax Amount
Foreign currency translation loss
Foreign currency translation loss
Foreign currency translation (loss) gain
Finite-Lived Intangible Assets Acquired
Finite-Lived Intangible Assets Acquired
Retirement Plan Type [Domain]
Liabilities, Current
Total Current Liabilities
Total Current Liabilities
Trading Price Threshold Per Principal Amount Portion
Trading price threshold per principal amount portion.
Trading price threshold per principal amount portion
Increase in accounts receivable
Increase (Decrease) in Accounts Receivable
Accounts receivable, net
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Adjustments to reconcile net loss to net cash provided by operating activities:
Other Comprehensive Income Loss Foreign Currency Transaction and Translation Adjustment Net Of Tax Due To Changes in Accounting Standard
Other comprehensive income loss foreign currency transaction and translation adjustment net of tax due to changes in accounting standard
Foreign currency translation adjustment, Net-of-Tax Amount
Convertible Notes Payable, Noncurrent
Non-current convertible senior notes, net of debt issuance costs
Inventory, Finished Goods, Net of Reserves
Finished goods
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale
Proceeds from sales and maturities of available-for-sale investments
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Payment of debt issuance cost
Payments of Debt Issuance Costs
Accounting Standards Update [Axis]
Accounting Standards Update
Entity Small Business
Entity Small Business
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]
Retained earnings
Retained Earnings (Accumulated Deficit), Ending Balance
Retained Earnings (Accumulated Deficit), Beginning Balance
Retained Earnings (Accumulated Deficit), Total
Retained Earnings (Accumulated Deficit)
Retained deficit
Retained Earnings
Expire Date of Exit Compensation
Expire Date of Exit Compensation
Expire date of exit compensation
Wells Fargo credit agreement.
Wells Fargo Credit Agreement [Member]
Wells Fargo Credit Agreement [Member]
Adtran Networks SE [Member]
Adtran Networks SE [Member]
Adtran networks SE.
Adtran Networks [Member]
Stock-Based Compensation
Share-Based Payment Arrangement [Text Block]
Backlog [Member]
Order or Production Backlog [Member]
Noncash or Part Noncash Acquisition, Value of Assets Acquired, Total
Noncash or Part Noncash Acquisition, Value of Assets Acquired
Purchases of property, plant and equipment included in accounts payable
Debt instrument, payment terms
Debt Instrument, Payment Terms
Amendment Flag
Amendment Flag
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount
Product and Service [Domain]
Product and Service
Interest Expense for 2030 Notes
Summary of Interest Expense [Table Text Block]
Summary of interest expense.
Inventory Disclosure [Text Block]
Inventory
Other international.
Other International [Member]
Other International [Member]
Liabilities and Equity [Abstract]
LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND EQUITY
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Net cash provided by operating activities
Common Stock [Member]
Common Stock [Member]
Summary of significant accounting policy.
Summary Of Significant Accounting Policy [Table]
Summary Of Significant Accounting Policy [Table]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Less: accumulated depreciation and amortization
Debt Securities, Available-for-Sale [Line Items]
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Interest Rate, Effective Percentage
Effective interest rate of debt instrument
Entity Address, Address Line One
Entity Address, Address Line One
Recurring Cash Compensation Per Share
Recurring cash compensation per share.
Recurring cash compensation per share
Defined Benefit Pension Plan Current And Noncurrent Assets Liabilities
Defined benefit pension plan current and noncurrent assets liabilities
Net pension liability
Net pension liability
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV
Earnings Per Share [Abstract]
Supplemental disclosure of cash financing activities:
Supplemental Cash Flow Information [Abstract]
Carrying Amount Of Revolving Agreement [Table Text Block]
Carrying amount of revolving agreement.
Carrying Amount of Non-Current Revolving Agreements
Carrying Amount of Revolving Agreement
Repayments on receivables purchase agreement.
Repayments on Receivables Purchase Agreement
Repayments on receivables purchase agreement
Repayments on receivables purchase agreement
Statement of Financial Position Location, Balance [Axis]
Balance Sheet Location
Stock issued during period annual recurring compensation value earned.
Stock Issued During Period Annual Recurring Compensation Value Earned
Annual recurring compensation earned
Debt Instrument Convertible Conversion Ratio Denominator
Debt instrument convertible conversion ratio denominator.
Principal amount of each convertible note
Commitments related to performance bonds.
Commitments Related To Performance Bonds
Commitments related to performance bonds
Deferred Tax Assets, Gross, Total
Deferred tax assets, gross
Deferred Tax Assets
Deferred tax assets
Less: Net Loss attributable to non-controlling interest
Net gain (loss) attributable to redeemable non-controlling interest
Less: Net Income (Loss) attributable to non-controlling interest
Net Income attributable to non-controlling interest
Less: Net Income attributable to non-controlling interest
Payments to Acquire Debt Securities, Available-for-Sale
Purchases of available-for-sale investments
Inventory Disclosure [Abstract]
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Net unrealized gain on available-for-sale securities
Land
Land
Document Type
Document Type
Proceeds from receivables purchase agreement.
Proceeds From Receivables Purchase Agreement
Proceeds from receivables purchase agreement
Income Taxes Paid, Net
Income Taxes Paid, Net, Total
Cash paid for income taxes, net
Gross Profit
Gross Profit
Gross Profit
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Cost of Revenue
Cost of Revenue [Abstract]
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Entity Central Index Key
Entity Central Index Key
Accounts receivable, allowance for credit losses
Accounts receivable, allowance for doubtful accounts
Accounts Receivable, Allowance for Credit Loss, Current
Line of Credit Facility [Table]
Line Of Credit Facility [Table]
Investments, Debt and Equity Securities [Abstract]
Cash proceeds from factoring agreement
Proceeds from Accounts Receivable
Proceeds from accounts receivable.
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation
Net increase in cash and cash equivalents
Net (decrease) increase in cash and cash equivalents
Subsequent Event Type [Domain]
Subsequent Event Type
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Anti-dilutive effect excluded calculation of diluted earnings per share
Common Stock, Par or Stated Value Per Share
Common stock, par value
Accounting Standards Update [Domain]
Accounting Standards Update
Licensed technology.
Licensed Technology [Member]
Licensed Technology [Member]
Base Rate [Member]
Base Rate Loans [Member]
Goodwill [Line Items]
Goodwill [Line Items]
Principal Amount Portion For Trading Price Threshold
Principal amount portion for trading price threshold.
Principal amount portion for trading price threshold
Realized Investment Gains (Losses), Total
Realized Investment Gains (Losses)
Net investment gain (loss)
Net realized gain (loss) on sales of securities
Term Benchmark Rate Loans [Member]
Term benchmark rate loans.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Number of Stock Options, Stock options exercised
ADTRAN Stock options exercised, Shares
Stock options exercised
Debt Disclosure [Abstract]
Germany [Member]
GERMANY
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Foreign Currency Translation Adjustments [Member]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income
Amortization of Convertible Notes Issuance Costs
Amortization of convertible notes issuance costs.
Amortization of convertible notes issuance costs
Wells Fargo Credit Agreement - US Borrower [Member]
Wells Fargo Credit Agreement U S Borrower [Member]
Wells fargo credit agreement US Borrower.
Current Fiscal Year End Date
Current Fiscal Year End Date
Schedule of Long-Term Debt Instruments [Table]
Document Quarterly Report
Document Quarterly Report
Customer Relationships [Member]
Customer Relationships [Member]
Entity Address, State or Province
Entity Address, State or Province
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Number of Shares, Unvested PSUs, RSUs and restricted stock outstanding, ending balance
Number of Shares, Unvested PSUs, RSUs and restricted stock outstanding, beginning balance
Redeemable Noncontrolling Interest [Line Items]
Letters of credit may be utilize
Line of Credit Facility, Remaining Borrowing Capacity
Secured borrowings, available for future borrowings
Increase (Decrease) in Other Accrued Liabilities
Accrued expenses and other liabilities
Investment, Name [Domain]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax
Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax
Common Stock Shares Covered Under Capped Call Transactions
Common stock shares covered under capped call transactions.
Common stock shares covered under capped call transactions
Geographical [Axis]
Geographical
Contract with Customer, Liability, Revenue Recognized
Recognized revenue
Optical Networking Solutions
Optical Networking Solutions [Member]
Optical Networking Solutions.
Revenue.
Revenue [Table]
Revenue [Table]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Summary of PSUs, RSUs and Restricted Stock
Accounts receivable
Account receivable sold.
Account Receivable Sold
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Loss, net of tax
Other Comprehensive (Loss) Income, net of tax
Stock Vested During Period Shares Restricted Stock Performance Stock Units And Restricted Stock Units
Stock vested during period shares restricted stock performance stock units and restricted stock units
ADTRAN RSUs and restricted stock vested, Shares
Deferred Income Tax Assets, Net, Total
Deferred Income Tax Assets, Net
Deferred tax assets
Long-Term Debt, Fair Value
Long-term debt, fair value
Subsequent Events [Member]
Subsequent Event [Member]
Commitments And Contingencies Line Items
Commitments And Contingencies Line Items
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Amounts reclassified from accumulated other comprehensive income (loss)
Property, Plant and Equipment [Abstract]
Other non-current assets
Other Assets, Noncurrent, Total
Other Assets, Noncurrent
Initial cap prices
Derivative, Cap Price
Antidilutive Securities [Axis]
Antidilutive Securities
Wells Fargo Credit Agreement - Subline [Member]
Wells Fargo Credit Agreement Subline [Member]
Wells fargo credit agreement Subline.
Interest Expense, Debt
Interest Expense, Debt, Total
Contractual interest
Related Party Transaction [Axis]
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income [Member]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name
Treasury Stock, Common, Shares
Treasury stock, shares
Goodwill Impairment
Goodwill impairment
Impairment charges related to goodwill
Goodwill impairment
Selling, General and Administrative Expense, Total
Selling, General and Administrative Expense
Selling, general and administrative expenses
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income
Debt Instrument, Maturity Date
Debt instrument, maturity date
Other comprehensive income loss net of tax due to changes in accounting standard.
Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard
Other comprehensive income (loss), net of tax
Net current period other comprehensive (loss) income
Minimum [Member]
Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted Avg. Grant Date Fair Value, PSUs, RSUs and restricted stock granted
Financial Instrument [Axis]
Purchase Agreement [Member]
Purchase Agreement [Member]
Purchase agreement.
Assets, Current [Abstract]
Current Assets
Other Comprehensive Income (Loss), Tax, Total
Other Comprehensive Income (Loss), Tax
Tax benefit in other comprehensive income (loss)
Total Other Comprehensive (Loss) Income, Tax (Expense) Benefit
Commitments And Contingencies Table
Commitments And Contingencies Table
Amortization of Intangible Assets, Total
Amortization of Intangible Assets
Amortization expense
Fair Value, Inputs, Level 3 [Member]
Significant Unobservable Inputs (Level 3) [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Deferred compensation plan assets.
Deferred Compensation Plan Assets [Member]
Deferred Compensation Plan Assets [Member]
Segment Reporting [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Cash Equivalents and Investments held at Fair Value
Liabilities, Current [Abstract]
Current Liabilities
Short Term Investments Deferred Compensation Current
Short term investments deferred compensation current.
Short-term investments - deferred compensation
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Accounts receivable, net
Accounts receivable, less allowance for credit losses of $191 as of June 30, 2024
Accounts receivable, less allowance for credit losses of $1,560 and $1,318 as of June 30, 2026 and December 31, 2025, respectively
Commitments and Contingencies
Commitments and contingencies (see Note 16)
Commitments and contingencies (see Note 17)
Service cost
Defined Benefit Plan, Service Cost
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Weighted Avg. Grant Date Fair Value, Unvested PSUs, RSUs and restricted stock outstanding, Beginning Balance
Weighted Avg. Grant Date Fair Value, Unvested PSUs, RSUs and restricted stock outstanding, Ending Balance
Reclassification out of Accumulated Other Comprehensive Income [Table]
Reclassification Out Of Accumulated Other Comprehensive Income [Table]
Inventory, Work in Process, Net of Reserves
Work in process
Deferred compensation liability
Deferred Compensation Liability, Current
Deferred Compensation Liability, Current, Total
Debt Instrument, Basis Spread on Variable Rate
Percentage of margin rate
Summary of Changes in Carrying Amount of Goodwill
Schedule of Goodwill [Table Text Block]
ADVA
ADVA Optical Networking SE [Member]
ADVA Optical Networking SE, [Member]
ADVA Optical Networking SE, [Member]
Perentage of gross margins.
Perentage of Gross Margins
Percentage of gross margins
Number of additional shares authorized to purchase.
Number of Additional Shares Authorized to Purchase
Number of additional shares authorized to purchase
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation
Effect of exchange rate changes
Net Loss
Net (loss) income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net Loss
Accrued Income Taxes, Current
Income tax payable, net
Income tax payable
Weighted Average Number of Shares Outstanding, Basic, Total
Weighted Average Number of Shares Outstanding, Basic
Weighted average shares outstanding – basic
Weighted average number of shares – basic
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]
Segments
Segments [Axis]
Subsequent Events [Text Block]
Subsequent Events
Inventory, Raw Materials, Net of Reserves
Raw materials
Services and support.
Services And Support [Member]
Services & Support [Member]
Revenue from External Customer [Line Items]
Revenue from External Customer [Line Items]
Acorn HoldCo, Incorporation [Member]
Acorn HoldCo, Inc.
Acorn HoldCo, Inc., [Member]
APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
ADTRAN Stock-based compensation expense
ADTRAN stock-based compensation expense
Variable Rate [Domain]
Defined benefit plan adjustments - actuarial loss
Defined benefit plan adjustments - actuarial gain (loss)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax, Total
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
Reclassification adjustment for amounts related to available-for-sale investments included in net (loss) gain, Tax (Expense) Benefit
Reclassification adjustment for amounts related to available-for-sale investments included in net (loss) gain, Tax (Expense) Benefit
Statement of Stockholders' Equity [Abstract]
Redeemable Noncontrolling Interest [Table]
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year
2026
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
Treasury Stock, Common [Member]
Treasury Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquired Finite-Lived Intangible Asset, Residual Value
Proceeds from Beneficial Interests in Securitized Accounts Receivable
Proceeds from beneficial interests in securitized accounts receivable.
Payments for beneficial interest in securitized accounts receivable
Pre-domination and profit and loss transfer agreement.
Pre Domination And Profit And Loss Transfer Agreement [Member]
Pre-DPLTA [Member]
UNITED STATES
United States [Member]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Defined Benefit Plan Adjustments [Member]
Non-controlling Interest [Member]
Noncontrolling Interest [Member]
Debt Instrument, Name [Domain]
Accrued Liabilities and Other Liabilities, Total
Accrued Liabilities and Other Liabilities
Accrued expenses and other liabilities
Accrued Expenses and Other Liabilities
Defined benefit pension plans for the remainder of fiscal year
Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Non-cancellable Contractual Maintenance Agreements Contractual Saas and Subscription Services and Hardware Orders [Member]
Non-cancellable Contractual Maintenance Agreements Contractual Saas and Subscription Services and Hardware Orders Member
Non-cancellable contractual maintenance agreements contractual saas and subscription services and hardware orders.
Redeemable NonControlling Interest Equity Redemption, Shares
Redeemable noncontrolling interest equity redemption, shares.
Redemption of redeemable non-controlling interest, Shares
Interest Expense, Total
Interest Expense, Operating and Nonoperating
Interest expense
Contractual interest
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date
Credit Facility [Axis]
Credit Facility
Equity Method Investment, Ownership Percentage
Equity method ownership percentage
Equity ownership percentage
Total Cost of Revenue
Cost of Product and Service Sold
Debt Instrument, Convertible, Minimum Aggregate Principal Outstanding
Debt instrument, convertible, minimum aggregate principal outstanding.
Convertible, minimum aggregate principal outstanding
Other Noncurrent Assets [Member]
Other Non-Current Assets [Member]
Treasury Stock, Value, Ending Balance
Treasury Stock, Value, Beginning Balance
Treasury Stock, Value, Total
Treasury Stock, Value
Treasury stock at cost: 266 shares as of June 30, 2024
Less treasury stock at cost: 258 and 262 shares as of June 30, 2026 and December 31, 2025, respectively
Increase (Decrease) in Income Taxes Payable
Income taxes payable
Income taxes payable, net
Line of Credit Facility, Average Outstanding Amount
Credit facility, average outstanding amount
Entity Address, City or Town
Entity Address, City or Town
Purchases Of Capped Calls Related To Convertible Senior Notes
Purchases of capped calls related to convertible senior notes.
Purchases of capped calls related to convertible senior notes
Number of Reportable Segments
Number of reportable segments
Security Exchange Name
Security Exchange Name
Credit Facility [Domain]
Credit Facility
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Redeemable Non-Controlling Interest
Domination and Profit and Loss Transfer Agreement [Member]
Domination and Profit and Loss Transfer Agreement.
DPLTA [Member]
Total property, plant and equipment
Property, Plant and Equipment, Gross, Ending Balance
Property, Plant and Equipment, Gross, Beginning Balance
Property, Plant and Equipment, Gross
Weighted average interest rate
Debt, Weighted Average Interest Rate
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]
Intangible Assets Disclosure [Text Block]
Intangible Assets
Loss Before Income Taxes
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Amortization of Revolving Credit Facility Issuance Costs
Amortization of revolving credit facility issuance costs.
Amortization of debt issuance cost
Antidilutive Securities, Name [Domain]
Total Inventory, net
Inventory, Net
Inventory, net
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activity
Statistical Measurement [Domain]
Statistical Measurement
Assets, Current
Total Current Assets
Stock-based compensation expense
Share-Based Payment Arrangement, Expense
Document Period End Date
Document Period End Date
Fair Value Hierarchy and NAV
Fair Value Hierarchy and NAV [Domain]
Commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Gain (Loss) on Disposition of Property Plant Equipment, Total
Gain (Loss) on Disposition of Property Plant Equipment
Net loss on disposal of property, plant and equipment
Net loss on disposal of property, plant and equipment
Convertible Senior Notes and Capped Calls
Long-Term Debt [Text Block]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life
Statement of Financial Position [Abstract]
Shares Exchange For Compensation In Cash Per Share
Shares exchange for compensation in cash per share.
Cash compensation per share
Antidilutive Security, Excluded EPS Calculation [Table]
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Stock Issued During Period Value Exercise Of Stock Options
Stock issued during period value exercise of stock options.
ADTRAN Stock options exercised
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax, Total
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net (loss) gain, Tax (Expense) Benefit
Available for future borrowings
Debt Instrument, Unused Borrowing Capacity, Amount
Liabilities
Total Liabilities
Total Liabilities
Financial Instruments [Domain]
Expected return on plan assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Variable Rate [Axis]
Finite-Lived Intangible Assets, Gross, Total
Finite-Lived Intangible Assets, Gross
Gross Carrying Amount
Weighted Average Number of Shares Outstanding, Diluted
Weighted average shares outstanding – diluted
Weighted average number of shares – diluted
Securities Act File Number
Entity File Number
Payments of Ordinary Dividends, Common Stock
Dividend payments
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount
Cover [Abstract]
Accrued Annual Recurring Compensation Obligation
Accrued Annual Recurring Compensation Obligation
Accrued annual recurring compensation obligation
Accrued annual recurring compensation to redeemable non-controlling shareholders
Redeemable non controlling interest equity redemption values.
Redeemable Non Controlling Interest Equity Redemption Values
Redemption of redeemable non-controlling interest
Prepaid Expense and Other Assets, Current
Prepaid expenses and other current assets
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Number of Shares, PSUs, RSUs and restricted stock forfeited
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax, Total
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax
Reclassification adjustment for amounts related to available-for-sale investments included in net (loss) gain, Before-Tax Amount
Reclassification adjustment for amounts related to available-for-sale investments included in net (loss) gain, Before-Tax Amount
Revenue.
Revenue [Line Items]
Revenue [Line Items]
Liability, Defined Benefit Pension Plan, Noncurrent
Non-current pension liability
Non-current pension liability
Non-current pension liability
Payment for annual recurring compensation to non-controlling interest.
Payment For Annual Recurring Compensation To Non-controlling Interest
Payment of annual recurring compensation to non-controlling interest
Segment Reporting Disclosure [Text Block]
Segment Information
Machinery and Equipment, Gross, Total
Machinery and Equipment, Gross
Engineering and other equipment
Subsequent Event [Table]
Finite-Lived Intangible Assets, Net
Finite-Lived Intangible Assets, Net, Ending Balance
Finite-Lived Intangible Assets, Net, Beginning Balance
Net Book Value
Debt Instrument, Convertible, Conversion Price
Common stock conversion price
The adjustment for RSUs is subject to a market condition based on the company's relative total shareholder return against all companies in the measured Index at the end of a performance period. The fair value of the award is based on the market price of our common stock on the date of grant, adjusted for the expected outcome of the impact of market conditions using a Monte Carlo Simulation valuation method.
Unvested Restricted Stock Units Dividends Accrual Adjustment For Market Changes
Dividends accrued on unvested restricted stock units
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Adopted Accounting Pronouncements
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Contract with Customer, Liability, Current
Unearned revenue
Comprehensive Income (Loss) [Table Text Block]
Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss)
Subscriber Solutions [Member]
Subscriber Solutions
Subscriber Solutions [Member]
Subscriber solutions.
Depreciation, Total
Depreciation
Depreciation expense
Payments On Financing Agreement
Payments on financing agreement.
Payments on financing agreement
Redeemable Non-controlling Interest Annual Recurring Compensation Earned
Redeemable Non-controlling Interest Annual Recurring Compensation Earned
Annual recurring compensation earned
Annual recurring compensation earned
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Unrecognized compensation expense related to other than options
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined benefit plan adjustments
Other receivables
Other Receivables, Net, Current, Total
Other Receivables, Net, Current
Long-term Investments, Total
Long-Term Investments
Long-term investments
Common Stock, Shares, Outstanding, Ending Balance
Common Stock, Shares, Outstanding, Beginning Balance
Common Stock, Shares, Outstanding
Common stock, shares outstanding
Depreciation, Depletion and Amortization, Total
Depreciation, Depletion and Amortization
Depreciation and amortization
Revenue, Remaining Performance Obligation, Amount
Remaining performance obligations
Document Transition Report
Document Transition Report
Research and development expenses
Research and Development Expense, Total
Research and Development Expense
Derivative, Price Risk Option Strike Price
Strike price
Cost of Revenue
Cost of Revenue
2030 Notes [Member]
Convertible Senior Notes Due Two Thousand and Thirty [Member]
Convertible senior notes due two thousand and thirty.
Redeemable non controlling interest recurring compensation earned.
Redeemable Non Controlling Interest Recurring Compensation Earned
Recurring cash compensation earned
Network solutions.
Network Solutions [Member]
Network Solutions [Member]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive Loss, net of tax
Comprehensive (Loss) Income, net of tax
Statement of Cash Flows [Abstract]
Percentage of Import Tariffs
Percentage of import tariffs.
Percentage of new import tariffs
Equity
Equity [Text Block]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets [Line Items]
Earnings Per Share [Text Block]
Loss Per Share
Foreign Government Securities / Bonds [Member]
Debt Security, Government, Non-US [Member]
Foreign Government Bonds [Member]
Net Loss attributable to ADTRAN Holdings, Inc.
Net Loss attributable to ADTRAN Holdings, Inc.
Inventory write down - business efficiency program
Inventory write down
Inventory Write-down
Inventory
Increase (Decrease) in Inventories, Total
Increase (Decrease) in Inventories
Inventory renegotiated charges
Profit loss including portion attributable to post domination and profit and loss transfer agreement.
Profit Loss Including Portion Attributable to Post Domination and Profit and Loss Transfer Agreement
Net (loss) income
Net loss
Income Taxes Receivable, Current
Income tax receivable
Intangible Assets, Net (Excluding Goodwill), Total
Intangible Assets, Net (Excluding Goodwill)
Intangibles assets, net
Line of Credit Facility [Line Items]
Line Of Credit Facility [Line Items]
Purchase Obligation
Purchase Obligation, Total
Purchase obligations
Accounts receivable gross
Accounts Receivable, before Allowance for Credit Loss
Assets [Abstract]
ASSETS
Document Fiscal Year Focus
Document Fiscal Year Focus
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in Accumulated Other Comprehensive Income, Net of Tax, by Component
Amount before accumulated depreciation of building structures held for productive use.
Building
Building
Other Assets [Member]
Other Receivables [Member]
Other Assets [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Remaining performance obligations, period
Revenue performance obligation, expected timing of satisfaction period
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Cash flows from investing activities:
Retirement Benefits [Abstract]
Accounts Payable, Current, Total
Accounts Payable, Current
Accounts payable
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Investments
Schedule of the Components of Net Periodic Pension Cost
Schedule of Net Benefit Costs [Table Text Block]
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Information about Receivable, Contract Assets, and Unearned Revenue from Contracts with Customers
Finite-Lived Intangible Asset, Expected Amortization, Year One
2027
Rule 10b5-1 Trading Plan [Member]
Rule 10b5-1 Trading Plan.
Proceeds from Stock Options Exercised
Proceeds from stock option exercises
Commitments and Contingencies Disclosure [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic
Net loss attributable to ADTRAN Holdings, Inc. common stockholders
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest, Total
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest
Net income attributable to redeemable non-controlling interests
Total non-current revolving credit facility
Revolving line of credit
Total line of credit
Line of credit
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total
Contract with Customer, Asset, after Allowance for Credit Loss, Current
Contract assets
Debt Instrument [Axis]
Defined Benefit Plan, Interest Cost
Interest cost
Share-Based Payment Arrangement [Abstract]
Assets, Fair Value Disclosure
Total
Increase decrease in prepaid expense, other current assets and other assets.
Increase Decrease In Prepaid Expense Other Current Assets And Other Assets
Prepaid expenses, other current assets and other assets
Asset, Held-for-Sale, Expected Disposal Period
Asset, held-for-sale, expected disposal period.
Expected disposal period
Increase (Decrease) in Income Taxes Receivable
Income taxes receivable, net
Income taxes receivable, net
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Net cash used in investing activities
Title of 12(b) Security
Title of 12(b) Security
Schedule of Segment Reporting Information, by Segment [Table]
Schedule Of Segment Reporting Information By Segment [Table]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Weighted Avg. Grant Date Fair Value, PSUs, RSUs and restricted stock forfeited
Money Market Funds [Member]
Money Market Funds [Member]
Income Tax Disclosure [Text Block]
Income Taxes
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Interest expense [Member]
Interest Expense [Member]
Patents [Member]
Other Liabilities, Noncurrent, Total
Other Liabilities, Noncurrent
Other non-current liabilities
Annual recurring compensation paid
Payments for Annual Recurring Compensation
Payments for annual recurring compensation.
Annual recurring compensation paid to redeemable non-controlling shareholders
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Changes in operating assets and liabilities:
Property, Plant and Equipment [Table Text Block]
Property, Plant and Equipment
Performance Share Units (PSUs), Restricted Stock Units (RSUs) And Restricted Stock [Member]
Performance share units (PSUs), restricted stock units (RSUs) and restricted stock.
PSUs, RSUs and Restricted Stock [Member]
Income Tax Disclosure [Abstract]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Commitments related to performance bonds expiration month and year.
Commitments Related To Performance Bonds Expiration Month And Year
Commitments related to performance bonds expiration month and year
United Kingdom [Member]
UNITED KINGDOM
Measurement Frequency [Domain]
Measurement Frequency
Statement of Income Location, Balance [Axis]
Income Statement Location
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Trading Symbol
Trading Symbol
Gain loss on investments and dividends.
Gain Loss On Investments And Dividends
Gain on investments, net
Intangible Asset, Finite-Lived [Table]
Schedule Of Finite Lived Intangible Assets [Table]
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment
Equity Securities, FV-NI, Current
Carrying value of investment
Marketable equity securities
Subsequent Event Type [Axis]
Subsequent Event Type
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Summary of Intangible Assets
Employee-related Liabilities, Current, Total
Employee-related Liabilities, Current
Accrued wages and benefits
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Cash flows from financing activities:
Fair Value, Recurring [Member]
Fair Value, Measurements [Member]
Interest and Debt Expense
Total interest expense
Equity Components [Axis]
Equity Components
Equity Component [Domain]
Equity Component
Number of shares tendered
Number of Shares Tendered
Number of shares tendered.
Business Combination [Axis]
Wells Fargo Credit Agreement German Borrower [Member]
Wells fargo credit agreement german borrower.
Wells Fargo Credit Agreement German Borrower [Member]
Cost of receivables
Cost of Receivables
Cost of receivables.
Investment Income, Interest and Dividend, Total
Investment Income, Interest and Dividend
Interest and dividend income
Depreciation, Depletion and Amortization, Nonproduction
Depreciation, Depletion and Amortization, Nonproduction, Total
Depreciation and amortization expense
Post-domination and profit and loss transfer agreement.
Post Domination And Profit And Loss Transfer Agreement [Member]
Post-DPLTA [Member]
U.S. Government Bonds [Member]
US Treasury and Government [Member]
Statement of Comprehensive Income [Abstract]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Maximum [Member]
Maximum [Member]
Factor [Member]
Factor [Member]
Factor.
Impairment of Intangible Assets (Excluding Goodwill), Total
Impairment of Intangible Assets (Excluding Goodwill)
Impairment losses of intangible assets
Debt Instrument, Convertible, Conversion Ratio
Debt instrument, conversion ratio
Statistical Measurement [Axis]
Statistical Measurement
Contract with Customer, Liability, Noncurrent
Non-current unearned revenue
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated Amortization
Common Stock, Value, Issued, Ending Balance
Common Stock, Value, Issued, Beginning Balance
Common Stock, Value, Issued, Total
Common Stock, Value, Issued
Common stock, par value 0.01 per shar 200,000 shares authorized; 79,121 shares issued and 78,855 outstanding as June 30, 2024
Common stock, par value $0.01 per share; 200,000 shares authorized; 81,453 shares issued and 81,195 outstanding as of June 30, 2026 and 80,188 shares issued and 79,926 outstanding as of December 31, 2025
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Reclassifications Out of Accumulated Other Comprehensive Income
Consolidation, Policy [Policy Text Block]
Basis of Presentation
Total Equity
Ending Balance
Beginning Balance
Equity, Including Portion Attributable to Noncontrolling Interest
Total Equity
Amortization of debt issuance cost
Amortization of Debt Issuance Costs
Amortization of issuance costs
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Estimated Future Amortization Expense Related to Intangible Assets
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total
Comprehensive Income (Loss) attributable to non-controlling interest
Less: Comprehensive Income attributable to non-controlling interest
Less: Comprehensive Income attributable to non-controlling interest
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class
Payment, Tax Withholding, Share-Based Payment Arrangement
Tax withholdings related to stock-based compensation settlements
Amortized cost and fair value debt securities.
Amortized Cost And Fair Value Debt Securities [Abstract]
Inventory reserves
Inventory, LIFO Reserve, Period Charge
Revenue from Contract with Customer [Text Block]
Revenue and Receivables
Entity Registrant Name
Entity Registrant Name
Credit Agreements
Debt Disclosure [Text Block]
Finite-Lived Intangible Asset, Expected Amortization, Year Two
2028
Other Nonoperating Income (Expense), Total
Other Nonoperating Income (Expense)
Other income (expense), net
Four Zero One K Savings Plans [Member]
Four zero one K savings plans.
401(k) Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income Loss [Table]
Subsequent Events [Abstract]
Finite-Lived Intangible Asset, Expected Amortization, Year Three
2029
Tax (expense) benefit
Income Tax Expense (Benefit), Total
Income Tax Expense (Benefit)
Income tax expense
Measurement Frequency [Axis]
Fair Value, Measurements [Member]
Network solutions other (credits) charges and inventory write-down.
Network Solutions Other (Credits) Charges and Inventory Write-Down [Member]
Network Solutions - Charges and Inventory Write-Down [Member]
Asset, Held-for-Sale, Not Part of Disposal Group, Current
Asset, Held-for-Sale, Not Part of Disposal Group, Current, Total
Assets held for sale
Total carrying value of assets held for sale
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Percentage of guaranteed interest rate.
Percentage of Guaranteed Interest Rate
Percentage of guaranteed interest rate
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated other comprehensive income
Accumulated Other Comprehensive Income
Convertible Debt [Table Text Block]
Outstanding Principal and Carrying Value of Convertible Senior Notes
Marketable equity securities - various industries.
Marketable Equity Securities Various Industries [Member]
Marketable Equity Securities [Member]
Payments to Acquire Property, Plant, and Equipment, Total
Payments to Acquire Property, Plant, and Equipment
Purchases of property, plant and equipment
Gain (Loss) on Investments, Total
Gain (Loss) on Investments
Net investment gain (loss)
Net investment gain
Share granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Number of Shares, PSUs, RSUs and restricted stock granted
Assets
Total Assets
Total Assets
Income Statement [Abstract]
Amortization of actuarial losses
Amortization of actuarial losses
Defined Benefit Plan, Amortization of Gain (Loss)
Deferred Income Tax Expense (Benefit), Total
Deferred Income Tax Expense (Benefit)
Deferred income taxes
Summary of significant accounting policy.
Summary Of Significant Accounting Policy [Line Items]
Summary Of Significant Accounting Policy [Line Items]
Stock vested during period value, restricted stock, performance stock units and restricted stock units
Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units
ADTRAN RSUs and restricted stock vested
Number of Shares, PSUs, RSUs and restricted stock vested
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Loss per share attributable to ADTRAN Holdings, Inc. - diluted
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted
Earnings Per Share, Diluted, Total
Earnings Per Share, Diluted
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Revenue and Gross Profit of Reportable Segments
City Area Code
City Area Code
Other Comprehensive Income (Loss), Net of Tax
Other comprehensive income (loss), net of tax
Other comprehensive loss, net of tax
Other Comprehensive (Loss) Income, net of tax
Licensing Agreements [Member]
Licensing Agreements [Member]
Proceeds from Lines of Credit, Total
Proceeds from draw on revolving credit agreements
Proceeds from Lines of Credit
Aggregate principal amount
Convertible senior notes
Principal amount of long term debt
Buildings and Improvements, Gross, Total
Buildings and Improvements, Gross
Building and land improvements
New Credit Agreement [Member]
New Credit Agreement [Member]
New Credit Agreement
Secured revolving credit facility amount
Credit agreement maximum borrowing capacity
Aggregate principal amount
Defined Benefit Plan [Table]
Line Of Credit Facility Expiration month and Year
Line of credit facility expiration month and year.
Maturity date
Percentage of Additional Ad Valorem Tariffs
Percentage of additional ad valorem tariffs.
Percentage of additional ad valorem tariffs
Sales information by product category.
Number Of Product Categories
Number of categories
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Finite lived intangible assets amortization expense after year four.
Finite Lived Intangible Assets Amortization Expense After Year Four
Thereafter
Property, plant and equipment
Total property, plant and equipment, net
Property, Plant and Equipment, Net, Ending Balance
Property, Plant and Equipment, Net, Beginning Balance
Property, Plant and Equipment, Net
Property, plant and equipment, net
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period
Corporate Bond Securities [Member]
Corporate Bonds [Member]
Operating Income (Loss)
Operating Loss
Goodwill, Foreign Currency Translation, Gain (Loss)
Foreign currency translation adjustments
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
Revenue Information by Geographic Area
Retained Earnings [Member]
Retained Deficit Earnings [Member]
Retained Deficit [Member]
Accounting Standard Update 2018-02.
Accounting Standard Update 2018-02 [Member]
ASU 2018-02 [Member]
Share-based Payment Arrangement, Noncash Expense, Total
Share-Based Payment Arrangement, Noncash Expense
Stock-based compensation expense
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax
Foreign currency translation adjustment, Tax (Expense) Benefit
Contract with Customer, Asset, Allowance for Credit Loss, Writeoff
Allowance for credit losses related to contract assets
Compensation Paid
Compensation Paid
Annual Recurring Compensation Paid
Fair Value, Inputs, Level 1 [Member]
Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Net cash used in financing activities
Unamortized Debt Issuance Expense
Less: unamortized debt issuance costs
Developed Technology Rights [Member]
Developed Technology [Member]
Deferred Income Tax Liabilities, Net
Deferred tax liabilities
Three Point Seven Five Percent Convertible Senior Notes Due Two Thousand and Thirty [Member]
3.75% Convertible Senior Notes Due 2030.
3.75% Convertible Senior Notes Due 2030 [Member]
Goodwill [Table]
Schedule Of Goodwill [Table]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax
Reclassification adjustment for amounts related to available-for-sale investments included in net (loss) gain, Net-of-Tax Amount
Reclassification adjustment for amounts related to available-for-sale investments included in net (loss) gain, Net-of-Tax Amount
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Schedule of Antidilutive Securities Excluded from Earnings Per Share Computation
Debt Securities, Available-for-Sale [Table]
Entity Interactive Data Current
Entity Interactive Data Current
Statement of Income Location, Balance [Domain]
Income Statement Location
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Total
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax
Foreign currency translation adjustment, Before-Tax Amount
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Cash flows from operating activities:
Repayment of revolving credit agreements
Repayments of Lines of Credit
Repayment of line of credit
Repayment of debt under revolving credit agreements
Exit compensation payments
Exit Compensation Payments
Exit compensation payments.
Aggregate Exit Compensation Payments Obligation
Aggregate Exit Compensation Payments Obligation
Aggregate exit compensation payments obligation including guaranteed interest
Credit agreement current borrowing capacity
Secured borrowings current borrowing capacity
Revolving credit loan
Entity Tax Identification Number
Entity Tax Identification Number
Equity
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Revenues [Abstract]
Revenue
Repayment of notes payable
Repayments of Notes Payable
Debt Instrument, Term
Term of credit agreement
Summary of Redeemable Non-controlling Interest Activity
Redeemable Noncontrolling Interest [Table Text Block]
Local Phone Number
Local Phone Number
Related Party Transaction [Domain]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net periodic benefit cost
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Denominator
Annual Recurring Compensation Obligation
Annual Recurring Compensation Obligation
Annual recurring compensation obligation
Revenue, Remaining Performance Obligation, Percentage
Remaining performance obligations, percentage
Accounting Policies [Abstract]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Other comprehensive (loss) income before reclassifications
Disaggregation of Revenue [Line Items]
Disaggregation Of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax, Total
Net revenue
Total Revenue
Revenue
Segment Reporting, Revenue from External Customer, Product and Service [Table]
Schedule Of Entity Wide Information Revenue From External Customers By Products And Services [Table]
Net Income (Loss) Attributable to Parent [Abstract]
Numerator
Market-based PSUs, RSUs and restricted stock.
Market Based Performance Stock Units Restricted Stock Units And Restricted Stock [Member]
Market-Based PSUs, RSUs and Restricted Stock [Member]
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Unrealized Gain (Loss) on Available-for-Sale Securities
Long-Term Line of Credit, Noncurrent
Non-current revolving credit agreement
Non-current revolving credit agreement outstanding
Commercial Paper [Member]
Commercial Paper [Member]
Shares available for issuance
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Recognition period of unvested compensation expense
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated goodwill impairment losses
Entity Emerging Growth Company
Entity Emerging Growth Company