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Organization - Additional Information (Detail) shares in Thousands		6 Months Ended
	Dec. 04, 2019 USD ($)	Mar. 31, 2023 Customer Segment shares	Dec. 31, 2022 shares	Sep. 30, 2022 shares	Jul. 06, 2022 USD ($)	Mar. 31, 2022 shares	Dec. 31, 2021 shares	Sep. 30, 2021 shares
Limited Partners' Capital Account [Line Items]
Number of reportable segments | Segment		1
Number of service contracts for natural gas and other heating systems		20,300
Number of customers to whom sell gasoline and diesel fuel		26,900
Sixth Amendment
Limited Partners' Capital Account [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility | $	$ 400,000,000				$ 400,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility | $	$ 550,000,000
Due date of debt	Jul. 06, 2027
Sixth Amendment | Term Loan
Limited Partners' Capital Account [Line Items]
Outstanding term loan | $	$ 165,000,000
Senior secured term loan maturity period	5 years
Petro Holdings, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of Star Acquisitions Inc.		100.00%
Number of residential and commercial home heating oil and propane customers served		412,100
Number of customers to whom only home heating oil, gasoline and diesel were sells on a delivery only basis		77,500
Star Group L.P.
Limited Partners' Capital Account [Line Items]
Percentage of limited partner interest		99.10%
Percentage of general partner interest		0.90%
Star Acquisitions, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of partnership		100.00%
Common Stock
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		35,603	35,681	36,092		36,950	37,942	39,046
General Partner
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		326	326	326		326	326	326

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