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Partnership Organization - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Schedule of Limited Partnership [Line Items]    
Percentage of limited partner interest 99.46%  
Percentage of general partner interest 0.54%  
Outstanding senior notes $ 124,408 [1] $ 124,357 [1]
Petro
    
Schedule of Limited Partnership [Line Items]    
Number of full-service residential and commercial home heating oil and propane customers served 412,000  
Number of customers to whom home heating oil, gasoline and diesel fuel were sold 54,600  
Number of customers to whom ancillary services were provided 11,600  
Senior Notes
    
Schedule of Limited Partnership [Line Items]    
Ownership interest in Star Gas Finance Company 100.00%  
Outstanding senior notes $ 125,000  
Interest on senior notes 8.875%  
Maturity of senior notes 2017  
Common Stock
    
Schedule of Limited Partnership [Line Items]    
Number of outstanding units 59,677 61,002
General Partner
    
Schedule of Limited Partnership [Line Items]    
Number of outstanding units 326 326
[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 $0.6 million at March 31, 2013. Under the terms of the indenture, these notes permit restricted payments after passing certain 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.