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Accumulated Other Comprehensive Income/(Loss) - Schedule of Effects on Net Income of Significant Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 29, 2025 | Mar. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 29, 2025 | Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net income from discontinued operations | $ 424,548 |  | $ 33,540 |  | $ 429,720 | $ 63,301
(Loss)/Gain on divestiture of business |  |  |  |  | 619,507 | 4,478
Net sales | 1,910,441 |  | 1,278,801 |  | 3,619,669 | 2,587,437
Cost of sales | (1,504,164) |  | (993,558) |  | (2,859,705) | (2,031,029)
Income from continuing operations before income taxes | 105,881 |  | 71,893 |  | 174,424 | 114,139
Provision for income taxes | (39,500) |  | (16,756) |  | (60,647) | (24,627)
Net income | 493,199 | $ 54,489 | 90,951 | $ 65,273 | 547,688 | 156,224
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net sales | 1,368 |  | 230 |  | 1,767 | 666
Cost of sales | (151) |  | (64) |  | (192) | (139)
Net income | (47,695) |  | (4,222) |  | (52,029) | (4,848)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Items |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net income | (47,955) |  | (2,913) |  | (51,747) | (2,913)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Items | Thermoformed and Flexible Packaging Business and its Global Trident Business |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net income from discontinued operations | (47,955) |  | 0 |  | (47,955) | 0
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Items | Tube and Core Operations |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
(Loss)/Gain on divestiture of business | 0 |  | 0 |  | (3,792) | 0
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Items | Black Diamond Capital Management LLC |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
(Loss)/Gain on divestiture of business | 0 |  | (2,913) |  | 0 | (2,913)
Reclassification out of Accumulated Other Comprehensive Income | Gains and Losses on Cash Flow Hedges |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income from continuing operations before income taxes | 1,217 |  | 166 |  | 1,575 | 527
Provision for income taxes | (319) |  | (147) |  | (410) | (159)
Net income | 898 |  | 19 |  | 1,165 | 368
Reclassification out of Accumulated Other Comprehensive Income | Gains and Losses on Cash Flow Hedges | Foreign exchange contracts |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net sales | 1,368 |  | 230 |  | 1,767 | 666
Cost of sales | (151) |  | (64) |  | (192) | (139)
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Items |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income from continuing operations before income taxes | (842) |  | (1,710) |  | (1,898) | (2,940)
Provision for income taxes | 204 |  | 382 |  | 451 | 637
Net income | (638) |  | (1,328) |  | (1,447) | (2,303)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of defined benefit pension items |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Non-operating pension costs | (842) |  | (1,199) |  | (1,898) | (2,429)
Reclassification out of Accumulated Other Comprehensive Income | Effect of settlement loss |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Non-operating pension costs | $ 0 |  | $ (511) |  | $ 0 | $ (511)

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