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Document and Entity Information - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Feb. 27, 2023 | Jun. 30, 2022
Cover [Abstract] |  |  |
Document Type | 10-K/A |  |
Amendment Flag | true |  |
Document Period End Date | Dec. 31, 2022 |  |
Document Fiscal Year Focus | 2022 |  |
Document Fiscal Period Focus | FY |  |
Trading Symbol | ADTN |  |
Entity Registrant Name | ADTRAN Holdings, Inc. |  |
Entity Central Index Key | 0000926282 |  |
Current Fiscal Year End Date | --12-31 |  |
Entity Well-known Seasoned Issuer | Yes |  |
Entity Current Reporting Status | Yes |  |
Entity Voluntary Filers | No |  |
Entity Filer Category | Large Accelerated Filer |  |
Entity Shell Company | false |  |
Entity Emerging Growth Company | false |  |
Entity Small Business | false |  |
ICFR Auditor Attestation Flag | true |  |
Entity Common Stock, Shares Outstanding |  | 78,630,365 |
Entity Public Float |  |  | $ 852,431,295
Entity Interactive Data Current | Yes |  |
Entity File Number | 000-41446 |  |
Entity Tax Identification Number | 87-2164282 |  |
Entity Address, Address Line One | 901 Explorer Boulevard |  |
Entity Address, City or Town | Huntsville |  |
Entity Address, State or Province | AL |  |
Entity Address, Postal Zip Code | 35806-2807 |  |
City Area Code | 256 |  |
Local Phone Number | 963-8000 |  |
Entity Incorporation, State or Country Code | DE |  |
Document Annual Report | true |  |
Document Transition Report | false |  |
Title of 12(b) Security | Common Stock, Par Value $0.01 |  |
Security Exchange Name | NASDAQ |  |
Auditor Name | PricewaterhouseCoopers LLP; |  |
Auditor Firm ID | 238 |  |
Auditor Location | Birmingham, Alabama |  |
Amendment Description | ADTRAN Holdings, Inc. (“ADTRAN,” the “Company,” “we,” “us” or “our”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment No. 1”) to amend and restate certain portions of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 1, 2023 (the “Original Filing”)As previously disclosed in the Company’s Current Report on Form 8-K filed on August 10, 2023, subsequent to the Company’s second fiscal quarter earnings call on August 8, 2023 and during the preparation of its unaudited condensed consolidated financial statements to be included in the Company’s Form 10-Q for the second fiscal quarter ended June 30, 2023, the Company determined that the principal amount of indebtedness outstanding under the Company’s revolving credit facility with a syndicate of banks, including Wells Fargo Bank, National Association (“Wells Fargo”), should be classified as noncurrent liabilities on the Company’s consolidated balance sheet. Therefore, the outstanding Wells Fargo revolving credit facility balances for the following prior periods were misclassified and have been adjusted from current to noncurrent liabilities on the balance sheets as follows: $60.0 million as of September 30, 2022, $60.0 million as of December 31, 2022, and $180.0 million as of March 31, 2023. Furthermore, the Company is also correcting certain errors related to the presentation of deferred tax assets (“DTAs”) and deferred tax liabilities (“DTLs”) in the Original Filing’s consolidated balance sheets that were previously assessed as immaterial errors.On August 10, 2023, the Audit Committee of the Board of Directors (the “Audit Committee”) of the Company concluded, after considering the recommendations of management and discussing with the Company’s independent registered public accounting firm, PricewaterhouseCoopers LLP (“PwC”), that (i) the Company’s unaudited condensed consolidated financial statements as of and for the quarter and year-to-date period ended September 30, 2022 included in the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2022, (ii) the Company’s audited consolidated financial statements as of and for the year ended December 31, 2022 included in the Original Filing, and (iii) the Company’s unaudited condensed consolidated financial statements as of and for the quarter ended March 31, 2023 included in the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2023, respectively (collectively, the “Non-Reliance Periods”), should not be relied upon. Additionally, the Audit Committee concluded that management’s report on internal control over financial reporting as of December 31, 2022, the opinion of PwC on the Company’s consolidated financial statements as of and for the fiscal year ended December 31, 2022 and the opinion of PwC on the effectiveness of the Company’s internal control over financial reporting as of December 31, 2022, should also no longer be relied upon.As a result of the above described misclassification and the identification of the material weakness (described further in Item 9A), the Company is filing this Amendment No. 1 to (i) restate the disclosure on the effectiveness of the Company’s disclosure controls and procedures and restate management’s report on internal control over financial reporting in Part II, Item 9A of the Original Filing, to reflect management’s conclusion that the Company’s internal control over financial reporting and disclosure controls and procedures were not effective as of December 31, 2022, (ii) restate the Company’s consolidated financial statements to reflect the adjustment as of December 31, 2022 of $60.0 million of short-term indebtedness to long-term indebtedness, as well as to correct the presentation of DTAs and DTLs as of December 31, 2022, (iii) add two additional risk factors related to the material weakness and restatement, (iv)restate the cash requirements table within Part II, Item 7, MD&A, of the Original Filing to reflect the adjustment as of December 31, 2022 of $60.0 million of short-term indebtedness to long-term indebtedness, (v) reissue the Report of the Independent Registered Public Accounting Firm, which appears in Part II, Item 8 of the Original Filing, and (vi) amend Part IV – Item 15 Exhibits and Financial Statement Schedules of the Original Filing to include currently dated certifications from the Company’s Chief Executive Officer and Chief Financial Officer as required by Section 302 and 906 of the Sarbanes-Oxley Act of 2002, as well as to fix certain immaterial errors.Pursuant to Rule 12b-15 promulgated by the SEC under the Securities Exchange Act of 1934, as amended, the Company has included the entire text of Part I, Item 1A, as well as Part II, Items 7, 8 and 9A, of the Original Filing in this Amendment No. 1. There have been no changes to the text of Part I, Item 1A or Part II, Items 7, 8 and 9A other than the changes stated in the immediately preceding paragraph. Other than as described above and through the inclusion with this Amendment No. 1 of new certifications by management, a new consent of PwC, and amendments to the list of exhibits contained in Part IV, Item 15 of the Original Filing, this Amendment No. 1 speaks only as of the date of the Original Filing and does not amend, supplement, or update any information contained in the Original Filing to give effect to any subsequent events (including with respect to the cover page of the Original Filing, which has been updated only to present this filing as Amendment No. 1 and to delete the reference to documents incorporated by reference into the Original Filing). Accordingly, this Amendment No. 1 should be read in conjunction with the Original Filing and the Company's reports (including any amendments thereto) filed with the SEC subsequent to the Original Filing. |  |

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