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. 29, 2018	$ 493,824	$ 518,494	$ (24,670)
Balance (in units) at Sep. 29, 2018		61,405
Net income	27,719	$ 27,719
Other comprehensive income	552		552
Partnership distributions	(36,843)	(36,843)
Common Units issued under Restricted Unit Plans	(1,349)	$ (1,349)
Common Units issued under Restricted Unit Plans (in units)		259
Compensation costs recognized under Restricted Unit Plans	3,021	$ 3,021
Balance, end of period at Dec. 29, 2018	486,924	$ 511,042	(24,118)
Balance (in units) at Dec. 29, 2018		61,664
Balance, beginning of period at Sep. 28, 2019	423,830
Balance, beginning of period (Including Cumulative Effect Adjustment of Lease Operation on Retained Earnings [Member]) at Sep. 28, 2019	423,938	$ 450,124	(26,186)
Balance (in units) (Including Cumulative Effect Adjustment of Lease Operation on Retained Earnings [Member]) at Sep. 28, 2019		61,735
Net income	40,163	$ 40,163
Other comprehensive income	541		541
Partnership distributions	(37,041)	(37,041)
Common Units issued under Restricted Unit Plans	(1,729)	$ (1,729)
Common Units issued under Restricted Unit Plans (in units)		335
Compensation costs recognized under Restricted Unit Plans	2,562	$ 2,562
Balance, end of period at Dec. 28, 2019	$ 428,434	$ 454,079	$ (25,645)
Balance (in units) at Dec. 28, 2019		62,070