Unit-Based Compensation Arrangements - Summary of Activity For Restricted Units Plans (Details) - 2009 Restricted Unit Plan [Member]	3 Months Ended
	Dec. 28, 2019 $ / shares shares
Units [Rollforward]
Outstanding, beginning of period (in units) | shares	988,339
Awarded (in units) | shares	470,060
Forfeited (in units) | shares	(100)
Vested (in units) | shares	(409,648)	[1]
Outstanding, end of period (in units) | shares	1,048,651
Weighted Average Grant Date Fair Value Per Unit [Abstract]
Outstanding, beginning of period (in dollars per unit) | $ / shares	$ 18.12
Awarded (in dollars per unit) | $ / shares	18.19
Forfeited (in dollars per unit) | $ / shares	(17.22)
Vested (in dollars per unit) | $ / shares	(19.46)	[1]
Outstanding, end of period (in dollars per unit) | $ / shares	$ 17.63

[1] During fiscal 2020, the Partnership withheld 74,401 Common Units from participants for income tax withholding purposes for those executive officers of the Partnership whose shares of restricted units vested during the period.