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Partnership Organization (Details Textual)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Common Stock [Member]
Sep. 30, 2011
Common Stock [Member]
Jun. 30, 2012
General Partner [Member]
Sep. 30, 2011
General Partner [Member]
Jun. 30, 2012
Petro [Member]
Customers
Partnership Organization (Textual) [Abstract]            
Number of outstanding units   61,024 64,970 326 326  
Number of Full-service residential and commercial home heating oil and propane customers served           419,000
Number of customers to whom home heating oil, gasoline and diesel fuel were sold           48,000
Number of customers to provide service           11,500
Partnership Organization (Additional Textual) [Abstract]            
Percentage of limited partner interest 99.50%          
Percentage of general partner interest 0.50%          
Ownership interest in Star Gas Finance Company 100.00%