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Net Income Per Common Unit - Additional Information (Details) - shares
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Mar. 31, 2018
Mar. 25, 2017
Earnings Per Share [Abstract]        
Increase in weighted average units outstanding used to compute basic net income per Common Unit to reflect the potential dilutive effect of the unvested restricted units outstanding (in units) 329,409 300,116 296,878 259,481