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Pension and Postretirement Benefits - Summary of Net Periodic Benefit Cost Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Jun. 30, 2019
COMPONENTS OF NET PERIODIC BENEFIT COST: |  |  |
Plan Settlements |  |  | $ 31,900
SERP Benefits |  |  |
COMPONENTS OF NET PERIODIC BENEFIT COST: |  |  |
Service Cost | $ 16 | $ 19 |
Interest Cost | 10 | 15 |
Amortization of Unrecognized Net Loss | 3 | 4 |
Net Periodic Benefit Cost | 29 | 38 |
Postretirement Benefits |  |  |
COMPONENTS OF NET PERIODIC BENEFIT COST: |  |  |
Service Cost | 3 | 3 |
Interest Cost | 4 | 6 |
Amortization of Prior Service Credit | (2) | (7) |
Amortization of Unrecognized Net Loss | 89 | 99 |
Net Periodic Benefit Cost | $ 94 | $ 101 |

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -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 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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