CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands	Total	At The Market Program [Member]	Common Unitholders [Member]	Accumulated Other Comprehensive (Loss) [Member]
Balance at Sep. 24, 2022	$ 497,530		$ 510,126	$ (12,596)
Balance (in units) at Sep. 24, 2022			62,987
Net income	123,752		$ 123,752
Amortization of net actuarial gains and prior service credits into earnings and net change in funded status of benefit plans	1,929			1,929
Partnership distributions	(82,383)		(82,383)
Common Units issued under Restricted Unit Plan, net of units withheld for income tax withholding purposes	(2,732)		$ (2,732)
Common Units issued under Restricted Unit Plan, net of units withheld for income tax withholding purposes (in units)			534
Net proceeds from the issuance of Common Units under an at-the-market equity program	0
Recognition in earnings of net actuarial loss for pension settlement	0
Compensation costs recognized under Restricted Unit Plan	8,260		$ 8,260
Balance at Sep. 30, 2023	546,356		$ 557,023	(10,667)
Balance (in units) at Sep. 30, 2023			63,521
Net income	74,174		$ 74,174
Amortization of net actuarial gains and prior service credits into earnings and net change in funded status of benefit plans	3,882			3,882
Partnership distributions	(83,090)		(83,090)
Common Units issued under Restricted Unit Plan, net of units withheld for income tax withholding purposes	(3,091)		$ (3,091)
Common Units issued under Restricted Unit Plan, net of units withheld for income tax withholding purposes (in units)			551
Net proceeds from the issuance of Common Units under an at-the-market equity program	0
Recognition in earnings of net actuarial loss for pension settlement	638			638
Compensation costs recognized under Restricted Unit Plan	8,191		$ 8,191
Balance at Sep. 28, 2024	547,060		$ 553,207	(6,147)
Balance (in units) at Sep. 28, 2024			64,072
Net income	106,570		$ 106,570
Amortization of net actuarial gains and prior service credits into earnings and net change in funded status of benefit plans	136			136
Partnership distributions	(84,175)		(84,175)
Common Units issued under Restricted Unit Plan, net of units withheld for income tax withholding purposes	(2,782)		$ (2,782)
Common Units issued under Restricted Unit Plan, net of units withheld for income tax withholding purposes (in units)			501
Common Units Market Public Offering (Share)			1,272
Net proceeds from the issuance of Common Units under an at-the-market equity program	23,459	$ 23,459
Recognition in earnings of net actuarial loss for pension settlement	528			528
Compensation costs recognized under Restricted Unit Plan	7,775		$ 7,775
Balance at Sep. 27, 2025	$ 598,571		$ 604,054	$ (5,483)
Balance (in units) at Sep. 27, 2025			65,845