Net Income Per Common Unit - Additional Information (Details) - shares	3 Months Ended		6 Months Ended
	Mar. 25, 2017	Mar. 26, 2016	Mar. 25, 2017	Mar. 26, 2016
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)	300,116	277,435	259,481	270,360