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Restatement of Quarterly Financial Information - Schedule of Restatement of Condensed Consolidated Statement of Loss and Condensed Consolidated Statement of Comprehensive Loss (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenues [Abstract] |  |  |  |  |
Total Revenue |  | $ 279,435,000 | $ 227,704,000 | $ 792,247,000 | $ 679,868,000
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  | 172,309,000 | 144,670,000 | 491,021,000 | 445,260,000
Gross Profit |  | 107,126,000 | 83,034,000 | 301,226,000 | 234,608,000
Selling, general and administrative expenses |  | 58,234,000 | 57,550,000 | 168,866,000 | 175,905,000
Research and development expenses |  | 51,680,000 | 51,577,000 | 152,434,000 | 172,144,000
Goodwill impairment |  | 0 | 0 | 0 | 297,353,000
Operating Loss |  | (2,788,000) | (26,093,000) | (20,074,000) | (410,794,000)
Interest and dividend income |  | 291,000 | 664,000 | 618,000 | 1,427,000
Interest expense |  | (5,499,000) | (5,679,000) | (14,824,000) | (17,183,000)
Net investment gain |  | 2,186,000 | 1,382,000 | 3,575,000 | 4,507,000
Other (expense), net |  | (745,000) | (850,000) | (2,437,000) | (441,000)
Loss Before Income Taxes |  | (6,555,000) | (30,576,000) | (33,142,000) | (422,484,000)
Income tax (expense) benefit |  | (1,202,000) | (390,000) | (1,821,000) | 16,121,000
Net Loss |  | (7,757,000) | (30,966,000) | (34,963,000) | (406,363,000)
Less: Net Income attributable to non-controlling interest | [1] | 2,505,000 | 2,382,000 | 7,097,000 | 7,417,000
Net Loss attributable to ADTRAN Holdings, Inc. |  | $ (10,262,000) | $ (33,348,000) | $ (42,060,000) | $ (413,780,000)
Weighted average shares outstanding – basic |  | 79,803 | 78,952 | 79,696 | 78,873
Weighted average shares outstanding – diluted |  | 79,803 | 78,952 | 79,696 | 78,873
Loss per common share attributable to ADTRAN Holdings, Inc. - basic | [2] | $ (0.12) | $ (0.38) | $ (0.5) | $ (5.21)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted | [2] | $ (0.12) | $ (0.38) | $ (0.5) | $ (5.21)
Net loss |  | $ (7,757,000) | $ (30,966,000) | $ (34,963,000) | $ (406,363,000)
Other Comprehensive Income (Loss), net of tax |  |  |  |  |
Defined benefit plan adjustments |  | (6,000) | 109,000 | 393,000 | 42,000
Foreign currency translation gain (loss) |  | (3,694,000) | 18,802,000 | 63,008,000 | (411,000)
Other Comprehensive (Loss) Income, net of tax |  | (3,700,000) | 18,911,000 | 63,401,000 | (369,000)
Comprehensive (Loss) Income, net of tax |  | (11,457,000) | (12,055,000) | 28,438,000 | (406,732,000)
Less: Comprehensive Income attributable to non-controlling interest |  | 2,505,000 | 2,382,000 | 7,097,000 | 7,417,000
Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax |  | (13,962,000) | (14,437,000) | 21,341,000 | (414,149,000)
Network Solutions [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Total Revenue |  | 232,543,000 | 181,488,000 | 654,258,000 | 541,955,000
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  | 153,107,000 | 128,320,000 | 434,669,000 | 381,359,000
Gross Profit |  | 79,436,000 | 53,496,000 | 219,589,000 | 151,999,000
Network Solutions - Inventory Write Down [Member] |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | (328,000) |  | 8,597,000
Services & Support [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Total Revenue |  | 46,892,000 | 46,216,000 | 137,989,000 | 137,913,000
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  | 19,202,000 | 16,678,000 | 56,352,000 | 55,304,000
Gross Profit |  | $ 27,690,000 | 29,538,000 | $ 81,637,000 | 82,609,000
As Reported [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Total Revenue |  |  | 227,704,000 |  | 679,868,000
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | 142,453,000 |  | 440,787,000
Gross Profit |  |  | 85,251,000 |  | 239,081,000
Selling, general and administrative expenses |  |  | 57,621,000 |  | 176,214,000
Research and development expenses |  |  | 51,614,000 |  | 172,253,000
Goodwill impairment |  |  |  |  | 292,583,000
Operating Loss |  |  | (23,984,000) |  | (401,969,000)
Interest and dividend income |  |  | 664,000 |  | 1,427,000
Interest expense |  |  | (5,679,000) |  | (17,183,000)
Net investment gain |  |  | 1,382,000 |  | 4,507,000
Other (expense), net |  |  | (850,000) |  | (441,000)
Loss Before Income Taxes |  |  | (28,467,000) |  | (413,659,000)
Income tax (expense) benefit |  |  | (390,000) |  | 16,121,000
Net Loss |  |  | (28,857,000) |  | (397,538,000)
Less: Net Income attributable to non-controlling interest |  |  | 2,382,000 |  | 7,417,000
Net Loss attributable to ADTRAN Holdings, Inc. |  |  | $ (31,239,000) |  | $ (404,955,000)
Weighted average shares outstanding – basic |  |  | 78,952 |  | 78,873
Weighted average shares outstanding – diluted |  |  | 78,952 |  | 78,873
Loss per common share attributable to ADTRAN Holdings, Inc. - basic |  |  | $ (0.36) |  | $ (5.1)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted |  |  | $ (0.36) |  | $ (5.1)
Net loss |  |  | $ (28,857,000) |  | $ (397,538,000)
Other Comprehensive Income (Loss), net of tax |  |  |  |  |
Defined benefit plan adjustments |  |  | 109,000 |  | 42,000
Foreign currency translation gain (loss) |  |  | 18,988,000 |  | (130,000)
Other Comprehensive (Loss) Income, net of tax |  |  | 19,097,000 |  | (88,000)
Comprehensive (Loss) Income, net of tax |  |  | (9,760,000) |  | (397,626,000)
Less: Comprehensive Income attributable to non-controlling interest |  |  | 2,382,000 |  | 7,417,000
Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax |  |  | (12,142,000) |  | (405,043,000)
As Reported [Member] | Network Solutions [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Total Revenue |  |  | 181,488,000 |  | 541,955,000
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | 126,103,000 |  | 376,886,000
As Reported [Member] | Network Solutions - Inventory Write Down [Member] |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | (328,000) |  | 859,000
As Reported [Member] | Services & Support [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Total Revenue |  |  | 46,216,000 |  | 137,913,000
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | 16,678,000 |  | 55,304,000
Adjustment [Member] |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | 2,217,000 |  | 4,473,000
Gross Profit |  |  | (2,217,000) |  | (4,473,000)
Selling, general and administrative expenses |  |  | (71,000) |  | (309,000)
Research and development expenses |  |  | (37,000) |  | (109,000)
Goodwill impairment |  |  |  |  | 4,770,000
Operating Loss |  |  | (2,109,000) |  | (8,825,000)
Loss Before Income Taxes |  |  | (2,109,000) |  | (8,825,000)
Net Loss |  |  | (2,109,000) |  | (8,825,000)
Net Loss attributable to ADTRAN Holdings, Inc. |  |  | $ (2,109,000) |  | $ (8,825,000)
Weighted average shares outstanding – basic |  |  | 78,952 |  | 78,873
Weighted average shares outstanding – diluted |  |  | 78,952 |  | 78,873
Loss per common share attributable to ADTRAN Holdings, Inc. - basic |  |  | $ (0.02) |  | $ (0.11)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted |  |  | $ (0.02) |  | $ (0.11)
Net loss |  |  | $ (2,109,000) |  | $ (8,825,000)
Other Comprehensive Income (Loss), net of tax |  |  |  |  |
Foreign currency translation gain (loss) |  |  | (186,000) |  | (281,000)
Other Comprehensive (Loss) Income, net of tax |  |  | (186,000) |  | (281,000)
Comprehensive (Loss) Income, net of tax |  |  | (2,295,000) |  | (9,106,000)
Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax |  |  | (2,295,000) |  | (9,106,000)
Adjustment [Member] | Network Solutions [Member] |  |  |  |  |
Cost of Revenue [Abstract] |  |  |  |  |
Total Cost of Revenue |  |  | $ 2,217,000 |  | $ 4,473,000
[1] | For the three and nine months ended September 30, 2025 we accrued $2.5 million and $7.5 million, respectively, net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the three and nine months ended September 30, 2024, we accrued $2.4 million and $7.4 million, respectively, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA.
[2] | Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $0.5 million and a $2.0 million effect of redemption of RNCI for the three and nine months ended September 30, 2025, respectively, and a $3.0 million effect of redemption of RNCI for the three and nine months ended September 30, 2024. See Note 16 for additional information.

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