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	37,977	$ 37,977
Other comprehensive income	593		593
Partnership distributions	(18,644)	(18,644)
Common Units issued under Restricted Unit Plans	(1,503)	$ (1,503)
Common Units issued under Restricted Unit Plans (in units)		376
Compensation costs recognized under Restricted Unit Plans	2,358	$ 2,358
Balance, end of period at Dec. 26, 2020	383,162	$ 408,345	(25,183)
Balance (in units) at Dec. 26, 2020		62,522
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	21,298	$ 21,298
Other comprehensive income	294		294
Partnership distributions	(20,325)	(20,325)
Common Units issued under Restricted Unit Plans	(2,049)	$ (2,049)
Common Units issued under Restricted Unit Plans (in units)		426
Compensation costs recognized under Restricted Unit Plans	2,709	$ 2,709
Balance, end of period at Dec. 25, 2021	$ 427,348	$ 444,638	$ (17,290)
Balance (in units) at Dec. 25, 2021		62,964