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Organization - Additional Information (Detail)
shares in Thousands
12 Months Ended
Jul. 02, 2018
USD ($)
Jul. 30, 2015
USD ($)
Sep. 30, 2018
Segment
Customer
Contract
shares
Sep. 30, 2017
shares
Sep. 30, 2016
shares
Sep. 30, 2015
shares
Limited Partners' Capital Account [Line Items]            
Number of reportable segments | Segment     1      
Percentage of limited partner interest     99.40%      
Percentage of general partner interest     0.60%      
Fourth Amendment            
Limited Partners' Capital Account [Line Items]            
Non Seasonal maximum borrowing capacity under revolving credit facility | $ $ 300,000,000 $ 300,000,000        
Maximum borrowing capacity (heating season December to April) under revolving credit facility | $ 450,000,000 $ 450,000,000        
Due date of debt   Jul. 02, 2023        
Fourth Amendment | Term Loan            
Limited Partners' Capital Account [Line Items]            
Outstanding senior notes | $ $ 100,000,000 $ 100,000,000        
Senior secured term loan maturity period 5 years 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 residential and commercial home heating oil and propane customers served | Customer     454,000      
Number of customers to whom only home heating oil, gasoline and diesel were sells on a delivery only basis | Customer     76,000      
Number of service contracts heating oil and propane for natural gas and other heating systems | Contract     16,000      
Number of customers to whom ancillary services were provided | Customer     23,000      
Petroleum Heat and Power Co., Inc.            
Limited Partners' Capital Account [Line Items]            
Ownership interest of partnership     100.00%      
Common Stock            
Limited Partners' Capital Account [Line Items]            
Number of outstanding units | shares     53,088 55,888 55,888 57,283
General Partner            
Limited Partners' Capital Account [Line Items]            
Number of outstanding units | shares     326 326 326 326