Distributions of Available Cash - Additional Information (Details)	6 Months Ended
	Mar. 31, 2018 $ / shares
Distributions Made To Members Or Limited Partners [Abstract]
Distributions to its partners	45 days
Declaration date of quarterly distribution	Apr. 26, 2018
Distributions paid (in dollars per unit)	$ 0.60
Common Unit distribution on an annualized basis (in dollars per unit)	$ 2.40
Distribution date of quarterly distribution	May 15, 2018
Date of record of quarterly distribution	May 08, 2018