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Organization - Additional Information (Detail) shares in Thousands |  |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 USD ($) | Jul. 30, 2015 USD ($) | Mar. 31, 2019 Segment Customer Contract shares | Dec. 31, 2018 shares | Sep. 30, 2018 shares | Mar. 31, 2018 shares | Dec. 31, 2017 shares | Sep. 30, 2017 shares
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  | 1 |  |  |  |  |
Percentage of general partner interest |  |  | 0.60% |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility | $ 300,000,000 |  |  |  |  |  |  |
Fourth 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 | $ 450,000,000 |  |  |  |  |  |
Due date of debt |  | Jul. 02, 2023 |  |  |  |  |  |
Fourth Amendment | Term Loan |  |  |  |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |
Outstanding senior notes | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  |
Senior secured term loan maturity period | 5 years | 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 |  |  | 81,000 |  |  |  |  |
Number of service contracts heating oil and propane for natural gas and other heating systems | Contract |  |  | 17,000 |  |  |  |  |
Star Group L.P. |  |  |  |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |
Percentage of limited partner interest |  |  | 99.40% |  |  |  |  |
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 |  |  | 50,302 | 52,489 | 53,088 | 54,607 | 55,888 | 55,888
General Partner |  |  |  |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |
Number of outstanding units | shares |  |  | 326 | 326 | 326 | 326 | 326 | 326

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