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Organization - Additional Information (Detail) shares in Thousands		6 Months Ended
	Dec. 04, 2019 USD ($)	Mar. 31, 2020 Segment Customer Contract shares	Dec. 31, 2019 shares	Sep. 30, 2019 shares	Mar. 31, 2019 shares	Dec. 31, 2018 shares	Sep. 30, 2018 shares	Jul. 02, 2018 USD ($)
Limited Partners' Capital Account [Line Items]
Number of reportable segments | Segment		1
Fifth Amendment
Limited Partners' Capital Account [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility | $	$ 300,000,000							$ 300,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility | $	$ 450,000,000
Due date of debt	Dec. 04, 2024
Fifth Amendment | Term Loan
Limited Partners' Capital Account [Line Items]
Outstanding term loan | $	$ 130,000,000
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 | Customer		448,000
Number of customers to whom only home heating oil, gasoline and diesel were sells on a delivery only basis | Customer		63,000
Number of service contracts for natural gas and other heating systems | Contract		18,000
Number of customers to whom sell gasoline and diesel fuel | Customer		26,000
Star Group L.P.
Limited Partners' Capital Account [Line Items]
Percentage of limited partner interest		99.30%
Percentage of general partner interest		0.70%
Star Acquisitions, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of partnership		100.00%
Petroleum Heat and Power Co., 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		45,622	46,404	47,685	50,302	52,489	53,088
General Partner
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		326	326	326	326	326	326

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