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Organization - Additional Information (Detail) shares in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 30, 2015 USD ($) | Sep. 30, 2017 Customer shares | Sep. 30, 2016 shares | Sep. 30, 2015 shares | Sep. 30, 2014 shares
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Percentage of limited partner interest |  | 99.40% |  |  |
Percentage of general partner interest |  | 0.60% |  |  |
Common Stock |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Number of outstanding units | shares |  | 55,887 | 55,887 | 57,282 | 57,405
Third Amendment |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility | $ | $ 300,000,000 |  |  |  |
Maximum borrowing capacity (heating season December to April) under revolving credit facility | $ | $ 450,000,000 |  |  |  |
Due date of debt | Jul. 30, 2020 |  |  |  |
Third Amendment | Term Loan |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Senior secured term loan maturity period | 5 years |  |  |  |
Star Acquisitions, Inc |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Ownership interest of partnership |  | 100.00% |  |  |
Petro Holdings, Inc |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Ownership interest of Star Acquisitions Inc. |  | 100.00% |  |  |
Number of full-service residential and commercial home heating oil and propane customers served |  | 455,000 |  |  |
Number of customers to whom only home heating oil, gasoline and diesel fuel were sold on a delivery only basis |  | 74,000 |  |  |
Number of customers to whom ancillary services were provided |  | 31,000 |  |  |
Petroleum Heat and Power Co., Inc. |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Ownership interest of partnership |  | 100.00% |  |  |
General Partner |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Number of outstanding units | shares |  | 326 | 326 | 326 | 326

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