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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification out of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning		$ (6,147)
Recognition in earnings of net actuarial loss for pension settlement		528	$ 638	$ 0
Other comprehensive income		664	4,520	1,929
Balance ending		(5,483)	(6,147)
Pension Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		(9,809)	(15,190)	(17,797)
Net change in plan obligation		339	3,254	680
Recognition in earnings of net actuarial loss for pension settlement	[1]	528	638	0
Reclassifications to earnings	[1]	245	1,489	1,927
Other comprehensive income		1,112	5,381	2,607
Balance, end of period		(8,697)	(9,809)	(15,190)
Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		3,662	4,523	5,201
Net change in plan obligation		278	164	463
Prior service credits		(14)	0	132
Reclassifications to earnings	[1]	(25)	(284)	(498)
Other comprehensive income		(448)	(861)	(678)
Balance, end of period		3,214	3,662	4,523
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		(6,147)	(10,667)	(12,596)
Other comprehensive income before reclassifications		603	3,418	1,275
Recognition in earnings of net actuarial loss for pension settlement		528	638	0
Reclassifications to earnings		(467)	464	654
Other comprehensive income		664	4,520	1,929
Balance, end of period		(5,483)	(6,147)	(10,667)
Amortization of Net (Gain) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassifications to earnings	[1]	$ (687)	$ (741)	$ (775)
[1] These amounts are included in the computation of net periodic benefit cost. See Note 12, “Employee Benefit Plans.”

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