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Unit-Based Compensation Arrangements - Summary of Activity For Restricted Units Plans (Details) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Jun. 29, 2019
$ / shares
shares
Units [Rollforward]  
Outstanding, beginning of period (in units) | shares 696,131
Awarded (in units) | shares 618,268
Forfeited (in units) | shares (5,205)
Vested (in units) | shares (319,510)
Outstanding, end of period (in units) | shares 989,684
Weighted Average Grant Date Fair Value Per Unit [Abstract]  
Outstanding, beginning of period (in dollars per unit) | $ / shares $ 19.47
Awarded (in dollars per unit) | $ / shares 18.13
Forfeited (in dollars per unit) | $ / shares (18.37)
Vested (in dollars per unit) | $ / shares (21.08)
Outstanding, end of period (in dollars per unit) | $ / shares $ 18.12