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Postretirement and Postemployment Benefits - Benefit Obligations and Plan Assets (Details) - Other Postretirement Benefits Plan - USD ($) $ in Thousands | 12 Months Ended
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Sep. 25, 2022 | Sep. 26, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |
Benefit obligation, beginning of year | $ 18,538 | $ 47,637
Service cost | 108 | 207
Interest cost | 340 | 429
Liability (gain)/loss due to curtailment | 0 | (23,830)
Actuarial loss (gain) | (4,729) | (4,285)
Benefits paid, net of premiums received | (1,958) | (1,678)
Medicare Part D subsidies | (12) | 58
Benefit obligation, end of year | 12,287 | 18,538
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets, beginning of year: | 26,802 | 25,706
Actual return on plan assets | (2,453) | 1,534
Employer contributions | 1,525 | 1,293
Benefits paid, net of premiums and Medicare Part D subsidies received | (2,105) | (1,795)
Plan participant contributions | 134 | 64
Fair value of plan assets, end of year | 23,903 | 26,802
Funded status | $ 11,616 | $ 8,264

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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