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Partnership Organization - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 8.875% Senior Notes | Sep. 30, 2013 8.875% Senior Notes | Sep. 30, 2012 8.875% Senior Notes | Sep. 30, 2014 Star Acquisitions, Inc | Sep. 30, 2014 Petro Holdings, Inc Customer | Sep. 30, 2014 Star Gas Finance Company | Sep. 30, 2014 Common Stock | Sep. 30, 2013 Common Stock | Sep. 30, 2012 Common Stock | Sep. 30, 2011 Common Stock | Sep. 30, 2014 General Partner | Sep. 30, 2013 General Partner | Sep. 30, 2012 General Partner | Sep. 30, 2011 General Partner
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding units |  |  |  |  |  |  |  |  |  |  | 57,405 | 57,718 | 61,002 | 64,970 | 326 | 326 | 326 | 326
Percentage of limited partner interest | 99.44% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of general partner interest | 0.56% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of partnership |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |
Ownership interest of Star Acquisitions Inc. |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Number of full-service residential and commercial home heating oil and propane customers served |  |  |  |  |  |  |  |  | 444,000 |  |  |  |  |  |  |  |  |
Number of customers to whom only home heating oil, gasoline and diesel fuel were sold on a delivery only basis |  |  |  |  |  |  |  |  | 68,000 |  |  |  |  |  |  |  |  |
Number of customers to whom ancillary services were provided |  |  |  |  |  |  |  |  | 22,000 |  |  |  |  |  |  |  |  |
Outstanding senior notes | $ 124,572 | [1] | $ 124,460 | [1] | $ 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on senior notes |  |  |  |  | 8.875% | 8.875% | 8.875% |  |  |  |  |  |  |  |  |  |  |
Maturity of public notes due |  |  |  |  | Dec. 01, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The 8.875% Senior Notes were originally issued in November 2010 in a private placement offering pursuant to Rule 144A and Regulation S under the Securities Act of 1933, and in February 2011, were exchanged for substantially identical public notes registered with the Securities and Exchange Commission. These public notes mature in December 2017 and accrue interest at an annual rate of 8.875% requiring semi-annual interest payments on June 1 and December 1 of each year. The discount on these notes was $0.4 million at September 30, 2014. Under the terms of the indenture, these notes permit restricted payments after passing particular financial tests. The Partnership can incur debt up to $100 million for acquisitions and can also pay restricted payments of $22.0 million without passing certain financial tests.

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