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Unit-Based Compensation Arrangements - Summary of Activity for the Restricted Units Plans (Details) - Restricted Stock Units (RSUs) [Member]
3 Months Ended
Dec. 24, 2016
$ / shares
shares
Units [Rollforward]  
Outstanding, beginning of period (in units) | shares 654,120
Awarded (in units) | shares 317,996
Forfeited (in units) | shares (916)
Issued (in units) | shares (294,713)
Outstanding, end of period (in units) | shares 676,487
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 (27.44)
Issued (in dollars per unit) | $ / shares (29.99)
Outstanding, end of period (in dollars per unit) | $ / shares $ 22.65