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Benefit Plans - Benefit Plan Related Information (Details) $ in Thousands, £ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 06, 2020 USD ($) | Jun. 27, 2020 USD ($) | Jun. 27, 2020 GBP (£) | Dec. 26, 2020 USD ($) | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Change in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  |  |  | $ 2,800 |  |
Service cost |  |  |  | 2,462 | $ 2,040 | $ 2,266
Interest cost |  |  |  | 2,173 | 3,169 | 3,104
Net actuarial loss | $ (13,400) |  |  |  |  |
Benefits paid from the plan assets |  | $ (10,400) | £ (8.4) |  |  |
Benefit obligation at end of year |  |  |  | 3,500 | 2,800 |
Change in plan assets at fair value: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  |  | 78,502 |  |
Fair value of plan assets at end of year |  |  |  | 100,478 | 78,502 |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |  |  |  |
Noncurrent assets |  |  |  | 39 | 885 |
Current benefit liability |  |  |  | (2,751) | (1,106) |
Noncurrent benefit liability |  |  |  | (45,802) | (38,198) |
Net liability recognized |  |  |  | (48,514) | (38,419) |
Pension Plan |  |  |  |  |  |
Change in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  |  |  | 116,921 | 102,833 |
Service cost |  |  |  | 2,462 | 2,040 |
Interest cost |  |  |  | 2,173 | 3,169 |
Net actuarial loss |  |  |  | 25,306 | 11,286 |
Benefits paid from the plan assets |  |  |  | (2,808) | (3,323) |
Benefits paid directly by the Company |  |  |  | (2,302) | (1,540) |
Curtailments and Settlements |  |  |  | 102 | (1,924) |
Effect of exchange rate movements |  |  |  | 7,462 | 1,735 |
Plan amendment and other |  |  |  | (324) | 2,645 |
Benefit obligation at end of year |  |  |  | 148,992 | 116,921 | 102,833
Change in plan assets at fair value: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  |  | 78,502 | 70,676 |
Actual return on plan assets |  |  |  | 7,053 | 8,222 |
Employer contributions |  |  |  | 12,918 | 2,233 |
Benefits paid from the plan assets |  |  |  | (2,808) | (3,323) |
Settlements |  |  |  | 0 | (1,072) |
Effect of exchange rate movements |  |  |  | 4,813 | 1,766 |
Fair value of plan assets at end of year |  |  |  | 100,478 | 78,502 | $ 70,676
Net amount unfunded status |  |  |  | $ (48,514) | $ (38,419) |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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