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Subsequent Events - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Millions					1 Months Ended							2 Months Ended	3 Months Ended				12 Months Ended			108 Months Ended	122 Months Ended
		Oct. 25, 2022 USD ($)	Oct. 01, 2022 USD ($) PartnershipUnit	Aug. 31, 2022 $ / shares	Nov. 30, 2022 $ / shares shares		Oct. 31, 2022 USD ($) $ / shares shares		Sep. 30, 2022 $ / shares shares	Aug. 31, 2022 shares	Jul. 31, 2022 $ / shares shares	Nov. 30, 2022 $ / shares shares	Sep. 30, 2022 $ / shares shares	Jun. 30, 2022 $ / shares shares	Mar. 31, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Sep. 30, 2022 USD ($) PartnershipUnit $ / shares shares	Sep. 30, 2021 USD ($) PartnershipUnit	Sep. 30, 2020 USD ($) PartnershipUnit	Sep. 30, 2021 $ / shares shares	Aug. 31, 2022 shares
Heating Oil Dealers
Subsequent Event [Line Items]
Number of businesses acquired | PartnershipUnit																	5	3	2
Aggregate purchase price partnership acquired																	$ 15.6	$ 42.5	$ 3.3
Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired | shares									129	116	126		371	487	992	1,104	2,954			21,979	19,900
Average Price Paid per Unit | $ / shares	[1]			$ 9.78					$ 8.89		$ 9.73		$ 9.46	$ 10.52	$ 10.50	$ 10.65	$ 10.43			$ 8.60
Subsequent Event
Subsequent Event [Line Items]
Sale of certain assets		$ 2.7
Subsequent Event | Heating Oil Dealers
Subsequent Event [Line Items]
Number of businesses acquired | PartnershipUnit			2
Aggregate purchase price partnership acquired			$ 1.2
Subsequent Event | Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired | shares					167		154					300
Average Price Paid per Unit | $ / shares					$ 8.71	[1]	$ 8.45	[1]				$ 8.59
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Distribution declared | $ / shares							0.1525
Partners capital projected distribution amount on annualized basis | $ / shares							0.61
Minimum dividend distribution per unit | $ / shares							$ 0.0675
Amount to paid to common unit holders							$ 5.5
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							Nov. 08, 2022
Dividend record date							Oct. 31, 2022
[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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