Unit-Based Compensation Arrangements - Summary of Activity for the Restricted Units Plans (Details) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Mar. 25, 2017 $ / shares shares
Units [Rollforward]
Outstanding, beginning of period (in units) | shares	654,120
Awarded (in units) | shares	317,996
Forfeited (in units) | shares	(1,658)
Issued (in units) | shares	(294,713)
Outstanding, end of period (in units) | shares	675,745
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	21.05
Forfeited (in dollars per unit) | $ / shares	(30.44)
Issued (in dollars per unit) | $ / shares	(29.99)
Outstanding, end of period (in dollars per unit) | $ / shares	$ 22.64