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v3.23.3

Postretirement and Postemployment Benefits - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 24, 2023 USD ($) | Sep. 25, 2022 USD ($) | Sep. 26, 2021 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amortization of prior service cost (credit) expected to be recognized during the next fiscal year | $ 800 |  |
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain expected to be recognized in net periodic pension cost during next fiscal year | 1,200 |  |
Amortization of prior service cost (credit) expected to be recognized during the next fiscal year | $ 400 |  |
Assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets | 5.00% | 5.00% | 4.00%
Non-current assets | $ 21,565 | $ 19,066 |
Expected future employer contributions, next fiscal year | 0 |  |
Postemployment benefit obligation | 11,252 | 12,287 | $ 18,538
Other Postretirement Benefits Plan | U.S. Small Cap Value Equity Common/Collective Fund |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investment in equity securities measured at fair value, recognized in net income | 900 | 800 |
Other Postretirement Benefits Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investment in equity securities measured at fair value, recognized in net income | $ 3,000 | 2,800 |
Maximum percentage of equity investment redeemable | 0.90 |  |
Other Postretirement Benefits Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Notice for redemption of equity investment | 90 days |  |
Other Postretirement Benefits Plan | Global Equity Long/Short Common/Collective Hedge Fund-of-funds | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Notice for redemption of equity investment | 120 days |  |
Other Postretirement Benefits Plan | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Purchases, sales or transfers of assets classified as level 3 | $ 0 | 0 |
Postemployment Retirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Curtailment gain | 0 | 0 | 23,830
Liability (gain)/loss due to curtailment |  |  | $ 23,800
Postemployment benefit obligation | 1,600 | 1,800 |
Retiree Medical Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Non-current assets | $ 400 | $ 600 |

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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(7)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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