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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
	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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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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