Unit-Based Compensation Arrangements - Summary of Activity In the Restricted Units Plans (Details) - 2018 Restricted Unit Plan [Member] - $ / shares		12 Months Ended
		Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021
Units [Rollforward]
Outstanding, beginning of period (in units)		1,516,229	1,231,863	961,816
Awarded (in units)		571,732	884,658	779,837
Forfeited (in units)		(15,552)	(12,845)	(26,070)
Vested (in units)	[1]	(706,047)	(587,447)	(483,720)
Outstanding, end of period (in units)		1,366,362	1,516,229	1,231,863
Weighted Average Grant Date Fair Value Per Unit [Abstract]
Outstanding, beginning of period (in dollars per unit)		$ 13.52	$ 15.26	$ 17.6
Awarded (in dollars per unit)		13.45	12.97	14.43
Forfeited (in dollars per unit)		(13.15)	(13.88)	(15.29)
Vested (in dollars per unit)	[1]	(14.59)	(16.32)	(18.58)
Outstanding, end of period (in dollars per unit)		$ 12.94	$ 13.52	$ 15.26

[1] During fiscal 2023, 2022 and 2021, the Partnership withheld 171,840, 138,039 and 92,336 Common Units, respectively, from participants for income tax withholding purposes for those executive officers of the Partnership whose shares of restricted units vested during the period.