CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Unitholders [Member]	Accumulated Other Comprehensive (Loss) [Member]
Balance, beginning of period at Sep. 26, 2020	$ 362,381	$ 388,157	$ (25,776)
Balance (in units) at Sep. 26, 2020		62,146
Net income	139,172	$ 139,172
Other comprehensive income	2,491		2,491
Partnership distributions	(56,159)	(56,159)
Common Units issued under Restricted Unit Plans	(1,534)	$ (1,534)
Common Units issued under Restricted Unit Plans (in units)		383
Compensation costs recognized under Restricted Unit Plans	7,524	$ 7,524
Balance, end of period at Jun. 26, 2021	453,875	$ 477,160	(23,285)
Balance (in units) at Jun. 26, 2021		62,529
Balance, beginning of period at Mar. 27, 2021	495,348	$ 519,368	(24,020)
Balance (in units) at Mar. 27, 2021		62,529
Net income	(26,021)	$ 26,021
Other comprehensive income	735		735
Partnership distributions	(18,758)	(18,758)
Compensation costs recognized under Restricted Unit Plans	2,571	2,571
Balance, end of period at Jun. 26, 2021	453,875	$ 477,160	(23,285)
Balance (in units) at Jun. 26, 2021		62,529
Balance, beginning of period at Sep. 25, 2021	425,421	$ 443,005	(17,584)
Balance (in units) at Sep. 25, 2021		62,538
Net income	193,865	$ 193,865
Other comprehensive income	1,515		1,515
Partnership distributions	(61,255)	(61,255)
Common Units issued under Restricted Unit Plans	(2,115)	$ (2,115)
Common Units issued under Restricted Unit Plans (in units)		437
Compensation costs recognized under Restricted Unit Plans	8,422	$ 8,422
Balance, end of period at Jun. 25, 2022	$ 565,853	$ 581,922	(16,069)
Balance (in units) at Jun. 25, 2022	62,975	62,975
Balance, beginning of period at Mar. 26, 2022	$ 585,149	$ 602,145	(16,996)
Balance (in units) at Mar. 26, 2022		62,968
Net income	(2,535)	$ (2,535)
Other comprehensive income	927		927
Partnership distributions	(20,466)	(20,466)
Common Units issued under Restricted Unit Plans	(35)	$ (35)
Common Units issued under Restricted Unit Plans (in units)		7
Compensation costs recognized under Restricted Unit Plans	2,813	$ 2,813
Balance, end of period at Jun. 25, 2022	$ 565,853	$ 581,922	$ (16,069)
Balance (in units) at Jun. 25, 2022	62,975	62,975