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Pension, Postretirement and Postemployment Benefits - Summary of Changes in Projected Benefit Obligation (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2020 | Dec. 27, 2020 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 27, 2020 | Dec. 29, 2019
Pension |  |  |  |  |  |
Change in Projected Benefit Obligation |  |  |  |  |  |
Service cost |  | $ 0 | $ 1,168 | $ 1,300 |  |
Interest cost |  | 1,466 | 6,624 | 13,358 |  |
Change in Plan Assets |  |  |  |  |  |
Transfers | $ 19,500 |  |  |  |  |
Pension | U.S. Facilities |  |  |  |  |  |
Change in Projected Benefit Obligation |  |  |  |  |  |
Projected benefit obligation — beginning |  | 30,971 | 395,718 |  |  |
Service cost |  | 0 | 1,168 |  |  |
Interest cost |  | 1,466 | 6,624 |  |  |
Transfer in |  | 14,796 | 0 |  |  |
Actuarial (gain) loss |  | 3,436 | (8,092) |  |  |
Benefits paid |  | (4,637) | (13,271) |  |  |
Expenses paid |  | 0 | (3,172) |  |  |
Curtailment |  | 0 | 0 |  |  |
Settlements paid |  | 0 | (348,004) |  |  |
Projected benefit obligation — ending |  | 46,032 | 30,971 | 395,718 |  |
Accumulated benefit obligation — ending |  | 46,032 | 30,971 |  |  |
Change in Plan Assets |  |  |  |  |  |
Fair value of plan assets — beginning |  | 0 | 357,224 |  |  |
Actual return on plan assets |  | 0 | 23,147 |  |  |
Employer contribution |  | 0 | 4,311 |  |  |
Benefits paid |  | 0 | (13,271) |  |  |
Expenses paid |  | 0 | (3,172) |  |  |
Settlement of U.S. defined benefit plan |  | 0 | (348,004) |  |  |
Transfers |  | 0 | (20,235) |  |  |
Fair value of plan assets — ending |  | 0 | 0 | 357,224 |  |
Reconciliation of Funded Status |  |  |  |  |  |
Projected benefit obligation |  | (30,971) | (30,971) | (395,718) | $ (46,032) | $ (30,971)
Fair value of plan assets |  | 0 | 357,224 | 357,224 | 0 | 0
Funded status |  |  |  |  | (46,032) | (30,971)
Unrecognized net loss |  |  |  |  | 15,787 | 13,054
Net amount |  |  |  |  | (30,245) | (17,917)
Accrued liabilities |  |  |  |  | (3,232) | (2,484)
Other liabilities |  |  |  |  | (42,800) | (28,487)
Accumulated other comprehensive (earnings) loss |  |  |  |  | 15,787 | 13,054
Net amount |  |  |  |  | (30,245) | (17,917)
Postretirement |  |  |  |  |  |
Change in Projected Benefit Obligation |  |  |  |  |  |
Service cost |  | 0 | 888 | 756 |  |
Interest cost |  | 919 | 1,267 | 1,171 |  |
Postretirement | U.S. Facilities |  |  |  |  |  |
Change in Projected Benefit Obligation |  |  |  |  |  |
Projected benefit obligation — beginning |  | 27,443 | 30,081 |  |  |
Service cost |  | 0 | 888 |  |  |
Interest cost |  | 919 | 1,267 |  |  |
Transfer in |  | 0 | 0 |  |  |
Actuarial (gain) loss |  | 3,382 | 6,350 |  |  |
Benefits paid |  | (1,797) | (1,641) |  |  |
Expenses paid |  | 0 | 0 |  |  |
Curtailment |  | 0 | (9,502) |  |  |
Settlements paid |  | 0 | 0 |  |  |
Projected benefit obligation — ending |  | 29,947 | 27,443 | 30,081 |  |
Accumulated benefit obligation — ending |  | 29,947 | 27,443 |  |  |
Change in Plan Assets |  |  |  |  |  |
Fair value of plan assets — beginning |  | 0 | 0 |  |  |
Actual return on plan assets |  | 0 | 0 |  |  |
Employer contribution |  | 0 | 0 |  |  |
Benefits paid |  | 0 | 0 |  |  |
Expenses paid |  | 0 | 0 |  |  |
Settlement of U.S. defined benefit plan |  | 0 | 0 |  |  |
Transfers |  | 0 | 0 |  |  |
Fair value of plan assets — ending |  | 0 | 0 | 0 |  |
Reconciliation of Funded Status |  |  |  |  |  |
Projected benefit obligation |  | (27,443) | (27,443) | (30,081) | (29,947) | (27,443)
Fair value of plan assets |  | $ 0 | $ 0 | $ 0 | 0 | 0
Funded status |  |  |  |  | (29,947) | (27,443)
Unrecognized net loss |  |  |  |  | 3,559 | 177
Net amount |  |  |  |  | (26,388) | (27,266)
Accrued liabilities |  |  |  |  | (1,740) | (1,767)
Other liabilities |  |  |  |  | (28,207) | (25,676)
Accumulated other comprehensive (earnings) loss |  |  |  |  | 3,559 | 177
Net amount |  |  |  |  | $ (26,388) | $ (27,266)

X
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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