Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 35,041	$ 1,294,252	$ 204,877	$ 1,644,870
Other comprehensive income (loss)	(8,241)	(22,160)	(5,068)	(18,136)
Ending balance	(327,226)	796,763	(327,226)	796,763
Total Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,091)	21,891	(7,264)	17,867
Other comprehensive income (loss)	(8,241)	(22,160)	(5,068)	(18,136)
Ending balance	(12,332)	(269)	(12,332)	(269)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(12,631)	(11,823)	(25,092)	(9,553)
Other comprehensive income (loss)	(5,284)	1,221	7,177	(1,049)
Ending balance	(17,915)	(10,602)	(17,915)	(10,602)
Derivatives, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7,160	32,894	16,448	26,600
Other comprehensive income (loss)	(2,957)	(23,381)	(12,245)	(17,087)
Ending balance	4,203	9,513	4,203	9,513
Pensions, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,380	820	1,380	820
Other comprehensive income (loss)	0	0	0	0
Ending balance	$ 1,380	$ 820	$ 1,380	$ 820

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Cornerstone Building Brands, Inc. 10-Q