Unit-Based Compensation Arrangements - Summary of Activity for the Restricted Units Plans (Details) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Jun. 25, 2016 $ / shares shares
Units [Rollforward]
Outstanding, beginning of period (in units) | shares	627,399
Awarded (in units) | shares	307,559
Forfeited (in units) | shares	(12,057)
Issued (in units) | shares	(255,678)
Outstanding, end of period (in units) | shares	667,223
Weighted Average Grant Date Fair Value Per Unit [Abstract]
Outstanding, beginning of period (in dollars per unit) | $ / shares	$ 31.87
Awarded (in dollars per unit) | $ / shares	23.62
Forfeited (in dollars per unit) | $ / shares	(25.44)
Issued (in dollars per unit) | $ / shares	(35.55)
Outstanding, end of period (in dollars per unit) | $ / shares	$ 26.77