Restructuring and Asset Impairments - Schedule of Restructuring and Restructuring-Related Asset Impairment Expenses by Type Incurred and by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	$ 9,752	$ 17,963	$ 23,333	$ 48,973
Other asset impairments	0	0	0	0
Restructuring/Asset impairment charges	9,752	17,963	23,333	48,973
Operating Segments \| Consumer Packaging
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	1,509	9,876	2,738	14,193
Operating Segments \| Industrial Paper Packaging
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	8,234	7,737	20,769	30,340
All Other
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	16	214	(16)	1,362
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	(7)	136	(158)	3,078
Severance and Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	6,367	5,480	13,365	23,271
Restructuring/Asset impairment charges			13,365
Asset Impairment/Disposal of Assets
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	1,381	10,898	6,482	19,020
Restructuring/Asset impairment charges			6,482
Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related asset impairment charges	$ 2,004	$ 1,585	3,486	$ 6,682
Restructuring/Asset impairment charges			$ 3,486

The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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