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Postretirement and Postemployment Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - Other Postretirement Benefits Plan - USD ($) $ in Thousands | 12 Months Ended
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Sep. 24, 2023 | Sep. 25, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Unrecognized net actuarial gain (loss) | $ 16,660 | $ 14,298
Unrecognized prior service benefit | 2,383 | 3,029
Amounts recognized in accumulated other comprehensive income (loss) | $ 19,043 | $ 17,327

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