Consolidated Statements of Loss - USD ($) shares in Thousands		3 Months Ended							6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 01, 2024	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2024	Sep. 30, 2024	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Revenue
Total Revenue		$ 242,852,000	$ 227,704,000	$ 225,991,000	$ 226,173,000				$ 452,164,000	$ 679,868,000	$ 922,720,000		$ 1,149,100,000		$ 1,025,536,000
Cost of Revenue
Total Cost of Revenue		153,296,000	144,670,000	144,732,000	155,858,000				300,590,000	445,260,000	598,556,000		817,973,000		698,284,000
Gross Profit		89,556,000	83,034,000	81,259,000	70,315,000				151,574,000	234,608,000	324,164,000		331,127,000		327,252,000
Selling, general and administrative expenses		57,013,000	57,550,000	59,364,000	58,991,000				118,355,000	175,905,000	232,918,000		258,610,000		208,889,000
Research and development expenses		49,314,000	51,577,000	60,352,000	60,215,000				120,567,000	172,144,000	221,458,000		258,311,000		173,757,000
Asset impairment											0		0		17,433,000
Goodwill impairment	$ 0	0	0	0	297,353,000				297,353,000	297,353,000	297,353,000		37,874,000		0
Operating Loss		(16,771,000)	(26,093,000)	(38,457,000)	(346,244,000)				(384,701,000)	(410,794,000)	(427,565,000)		(223,668,000)		(72,827,000)
Interest and dividend income		1,631,000	664,000	366,000	397,000				763,000	1,427,000	3,058,000		2,340,000		2,123,000
Interest expense		(4,870,000)	(5,679,000)	(6,906,000)	(4,598,000)				(11,504,000)	(17,183,000)	(22,053,000)		(16,299,000)		(3,437,000)
Net investment gain (loss)		(920,000)	1,382,000	872,000	2,253,000				3,125,000	4,507,000	3,587,000		2,754,000		(11,339,000)
Other income, net		687,000	(850,000)	(901,000)	1,310,000				409,000	(441,000)	246,000		1,266,000		14,517,000
Loss Before Income Taxes		(20,243,000)	(30,576,000)	(45,026,000)	(346,882,000)				(391,908,000)	(422,484,000)	(442,727,000)		(233,607,000)		(70,963,000)
Income tax (expense) benefit		(23,461,000)	(390,000)	(2,136,000)	18,647,000				16,511,000	16,121,000	(7,340,000)		(28,299,000)		62,075,000
Net Loss		(43,704,000)	(30,966,000)	(47,162,000)	(328,235,000)	$ (800,000)	$ (100,000)	$ (0)	(375,397,000)	(406,363,000)	(450,067,000)		(261,906,000)		(8,888,000)
Net Income (Loss) attributable to non-controlling interest		2,407,000	2,382,000	2,505,000	2,530,000				5,035,000	7,417,000	9,824,000	[1],[2]	6,946,000	[1],[3]	(6,851,000)	[1]
Net Loss attributable to ADTRAN Holdings, Inc.		$ (46,111,000)	$ (33,348,000)	$ (49,667,000)	$ (330,765,000)				$ (380,432,000)	$ (413,780,000)	$ (459,891,000)		$ (268,852,000)		$ (2,037,000)
Weighted average shares outstanding – basic		79,091	78,952	78,852	78,814				78,803	78,873	78,928		78,416		62,346
Weighted average shares outstanding – diluted		79,091	78,952	78,852	78,814				78,803	78,873	78,928		78,416		62,346
Loss per common share attributable to ADTRAN Holdings, Inc. - basic		$ (0.58)	$ (0.38)	$ (0.63)	$ (4.2)				$ (4.83)	$ (5.21)	$ (5.79)	[4]	$ (3.43)		$ (0.03)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted		$ (0.58)	$ (0.38)	$ (0.63)	$ (4.2)				$ (4.83)	$ (5.21)	$ (5.79)	[4]	$ (3.43)		$ (0.03)
Network Solutions [Member]
Revenue
Total Revenue		$ 197,009,000	$ 181,488,000	$ 179,194,000	$ 181,273,000				$ 360,467,000	$ 541,955,000	$ 738,964,000		$ 974,389,000		$ 916,793,000
Cost of Revenue
Total Cost of Revenue		135,861,000	128,320,000	124,773,000	128,266,000				253,039,000	381,359,000	517,220,000		724,518,000		647,105,000
Gross Profit											213,147,000		225,558,000		269,688,000
Goodwill impairment					297,400,000
Network Solutions - Inventory Write-Down and Other Changes [Member]
Cost of Revenue
Total Cost of Revenue					8,782,000						8,597,000		24,313,000		0
Services & Support [Member]
Revenue
Total Revenue		45,843,000	46,216,000	46,797,000	44,900,000				91,697,000	137,913,000	183,756,000		174,711,000		108,743,000
Cost of Revenue
Total Cost of Revenue		$ 17,435,000	$ 16,678,000	$ 19,816,000	18,810,000				$ 38,626,000	$ 55,304,000	72,739,000		69,142,000		51,179,000
Gross Profit											$ 111,017,000		105,569,000		$ 57,564,000
Goodwill impairment					$ 0								$ 37,900,000

[1] For the year ended December 31, 2024 we accrued $9.8 million of net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the year ended December 31, 2023, we accrued $10.1 million, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA, partially offset by a $3.2 million net loss attributable to non-controlling interests pre-DPLTA.12-24

[2] For the year ended December 31, 2024 we accrued $9.8 million of net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA

[3] For the year ended December 31, 2023, we have recognized $10.1 million, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA partially offset by a $3.2 million net loss attributable to non-controlling interests pre-DPLTA for the year ended December 31, 2023.

[4] Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $3.0 million effect of redemption of RNCI for the year ended December 31, 2024. See Note 19 for additional information.