Unit-Based Compensation Arrangements - Summary of Activity For Restricted Units Plans (Details) - 2009 Restricted Unit Plan [Member]	6 Months Ended
	Mar. 28, 2020 $ / shares shares
Units [Rollforward]
Outstanding, beginning of period (in units) | shares	988,339
Awarded (in units) | shares	471,111
Forfeited (in units) | shares	(433)
Vested (in units) | shares	(414,708)	[1]
Outstanding, end of period (in units) | shares	1,044,309
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	(17.06)
Vested (in dollars per unit) | $ / shares	(19.46)	[1]
Outstanding, end of period (in dollars per unit) | $ / shares	$ 17.62

[1] During fiscal 2020, the Partnership withheld 76,453 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.