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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 |

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