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Subsequent Events - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Millions		1 Months Ended	3 Months Ended		12 Months Ended			120 Months Ended	131 Months Ended
		Oct. 31, 2023 USD ($) PartnershipUnit $ / shares shares	Mar. 31, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares	Sep. 30, 2023 USD ($) PartnershipUnit $ / shares shares	Sep. 30, 2022 USD ($) PartnershipUnit	Sep. 30, 2021 USD ($) PartnershipUnit	Sep. 30, 2022 $ / shares shares	May 31, 2023 shares
Heating Oil Businesses
Subsequent Event [Line Items]
Number of businesses acquired | PartnershipUnit					2	5	3
Aggregate purchase price partnership acquired					$ 19.8	$ 15.6	$ 42.5
Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired | shares			78	411	489			24,933	20,500
Average Price Paid per Unit | $ / shares	[1]		$ 11.2	$ 8.77	$ 9.16			$ 8.82
Subsequent Event | Heating Oil Businesses
Subsequent Event [Line Items]
Number of businesses acquired | PartnershipUnit		2
Aggregate purchase price partnership acquired		$ 2.5
Subsequent Event | Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired | shares		13
Average Price Paid per Unit | $ / shares	[1]	$ 11.27
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Distribution declared | $ / shares		0.1625
Partners capital projected distribution amount on annualized basis | $ / shares		0.65
Minimum dividend distribution per unit | $ / shares		$ 0.0675
Amount to paid to common unit holders		$ 5.8
Amount to paid to the General Partner		0.3
Incentive distribution to the General Partner		0.3
Incentive distributions to management		$ 0.3
Dividend paid date		Oct. 30, 2023
Dividend record date		Oct. 20, 2023
[1] Amounts include repurchase costs.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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