CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands	Total	Common Unitholders [Member]	Accumulated Other Comprehensive (Loss) [Member]
Balance at Sep. 26, 2020	$ 362,381	$ 388,157	$ (25,776)
Balance (in units) at Sep. 26, 2020		62,146
Net Income (Loss)	122,793	$ 122,793
Amortization of net actuarial gains (losses) and prior service credits into earnings and net change in funded status of benefit plans	7,234		7,234
Partnership distributions	(76,484)	(76,484)
Common Units issued under Restricted Unit Plans	(1,534)	$ (1,534)
Common Units issued under Restricted Unit Plans (in units)		392
Recognition in earnings of net actuarial loss for pension settlement	958		958
Compensation costs recognized under Restricted Unit Plans	10,073	$ 10,073
Balance at Sep. 25, 2021	425,421	$ 443,005	(17,584)
Balance (in units) at Sep. 25, 2021		62,538
Net Income (Loss)	139,708	$ 139,708
Amortization of net actuarial gains (losses) and prior service credits into earnings and net change in funded status of benefit plans	4,148		4,148
Partnership distributions	(81,725)	(81,725)
Common Units issued under Restricted Unit Plans	(2,115)	$ (2,115)
Common Units issued under Restricted Unit Plans (in units)		449
Recognition in earnings of net actuarial loss for pension settlement	840		840
Compensation costs recognized under Restricted Unit Plans	11,253	$ 11,253
Balance at Sep. 24, 2022	497,530	$ 510,126	(12,596)
Balance (in units) at Sep. 24, 2022		62,987
Net Income (Loss)	123,752	$ 123,752
Amortization of net actuarial gains (losses) 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 Plans	(2,732)	$ (2,732)
Common Units issued under Restricted Unit Plans (in units)		534
Recognition in earnings of net actuarial loss for pension settlement	0
Compensation costs recognized under Restricted Unit Plans	8,260	$ 8,260
Balance at Sep. 30, 2023	$ 546,356	$ 557,023	$ (10,667)
Balance (in units) at Sep. 30, 2023		63,521