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Net Periodic Pension Cost (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) employee | Sep. 29, 2018 USD ($) | Sep. 28, 2019 USD ($) employee | Sep. 29, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | $ 29 | $ 133 | $ 190 | $ 399
Interest cost on projected benefit obligation |  | 881 | 963 | 2,899 | 2,889
Expected return on plan assets |  | (1,339) | (1,327) | (3,828) | (3,981)
Amortization of unrecognized loss |  | 278 | 271 | 857 | 813
Net periodic pension cost (benefit) |  | $ (151) | $ 40 | $ 118 | $ 120
Number of participants not accruing future years of service | employee |  | 49 |  | 49 |
Decrease in pension benefit obligation |  | $ 100 |  | $ 300 |
Decrease to AOCI, plan asset valuation |  | $ 2,500 |  | $ 2,700 |
Forecast |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected lump sum pension payment | $ 9,500 |  |  |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 (h)(4) -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 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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