Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		1 Months Ended					3 Months Ended			9 Months Ended		131 Months Ended	132 Months Ended
		Jul. 31, 2024	Jul. 30, 2024	Jun. 30, 2024	May 31, 2024	Apr. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	May 31, 2023	Sep. 30, 2023
Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired				371	86	141	598	218	13			20,500	25,422
Average price paid per unit	[1]			$ 10.97	$ 10.83	$ 10.58	$ 10.86	$ 10.92	$ 11.27				$ 8.82
Heating Oil Businesses
Subsequent Event [Line Items]
Business purchase consideration										$ 22.6	$ 1.2
Subsequent Event | Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired			112
Average price paid per unit	[1]		$ 11.02
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Distribution declared		$ 0.1725
Partners capital projected distribution amount on annualized basis		0.69
Minimum dividend distribution per unit		$ 0.0675
Amount paid to common unit holders		$ 6.0
Amount paid to the General Partner		0.4
Incentive distribution to the General Partner		0.3
Incentive distributions to management		$ 0.3
Dividend payable date		Aug. 07, 2024
Dividend record date		Jul. 29, 2024
Subsequent Event | Heating Oil Businesses
Subsequent Event [Line Items]
Business purchase consideration		$ 35.0

[1] Amount includes repurchase costs.