Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 29, 2024	Jun. 24, 2023	Jun. 29, 2024	Jun. 24, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning				$ (10,667)
Recognition in earnings of net actuarial loss for pension settlement		$ 550	$ 0	550	$ 0
Other comprehensive income		719	164	1,057	491
Balance ending		(9,610)		(9,610)
Pension Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning		(14,339)	(16,834)	(15,190)	(17,797)
Reclassifications to earnings	[1]	425	482	1,276	1,445
Recognition in earnings of net actuarial loss for pension settlement	[1]	550	0	550	0
Other comprehensive income		975	482	1,826	1,445
Balance ending		(13,364)	(16,352)	(13,364)	(16,352)
Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning		4,010	4,565	4,523	5,201
Amortization of net gain and prior service credits	[1]	(256)	(318)	(769)	(954)
Other comprehensive income		(256)	(318)	(769)	(954)
Balance ending		3,754	4,247	3,754	4,247
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance beginning		(10,329)	(12,269)	(10,667)	(12,596)
Reclassifications to earnings		169	164	507	491
Recognition in earnings of net actuarial loss for pension settlement		550	0	550	0
Other comprehensive income		719	164	1,057	491
Balance ending		$ (9,610)	$ (12,105)	$ (9,610)	$ (12,105)

[1] These amounts are included in the computation of net periodic benefit cost. See Note 15, “Pension Plans and Other Postretirement Benefits.”