Unit-Based Compensation Arrangements - Summary of Activity for the Restricted Units Plans (Details) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Jun. 24, 2017 $ / shares shares
Restricted Units [Rollforward]
Outstanding, beginning of period (in units) | shares	654,120
Awarded (in units) | shares	323,715
Forfeited (in units) | shares	(1,758)
Vested (with Common Units issued) (in units) | shares	(323,752)
Outstanding, end of period (in units) | shares	652,325
Weighted Average Grant Date Fair Value Per Unit [Abstract]
Outstanding, beginning of period (in dollars per unit) | $ / shares	$ 26.74
Awarded (in dollars per unit) | $ / shares	21.00
Forfeited (in dollars per unit) | $ / shares	(30.65)
Vested (with Common Units issued) (in dollars per unit) | $ / shares	(30.11)
Outstanding, end of period (in dollars per unit) | $ / shares	$ 22.21