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Document and Entity Information
 6 Months Ended
Mar. 31, 2014
Apr. 30, 2014
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2  
Trading Symbol SGU  
Entity Registrant Name STAR GAS PARTNERS LP  
Entity Central Index Key 0001002590  
Current Fiscal Year End Date --09-30  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   57,467,744