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Organization - Additional Information (Detail) shares in Thousands		12 Months Ended
	Jul. 30, 2015 USD ($)	Sep. 30, 2017 Customer shares	Sep. 30, 2016 shares	Sep. 30, 2015 shares	Sep. 30, 2014 shares
Limited Partners' Capital Account [Line Items]
Percentage of limited partner interest		99.40%
Percentage of general partner interest		0.60%
Common Stock
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		55,887	55,887	57,282	57,405
Third Amendment
Limited Partners' Capital Account [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility | $	$ 300,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility | $	$ 450,000,000
Due date of debt	Jul. 30, 2020
Third Amendment | Term Loan
Limited Partners' Capital Account [Line Items]
Senior secured term loan maturity period	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 full-service residential and commercial home heating oil and propane customers served		455,000
Number of customers to whom only home heating oil, gasoline and diesel fuel were sold on a delivery only basis		74,000
Number of customers to whom ancillary services were provided		31,000
Petroleum Heat and Power Co., Inc.
Limited Partners' Capital Account [Line Items]
Ownership interest of partnership		100.00%
General Partner
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		326	326	326	326

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Line of credit facility maximum borrowing capacity during the heating season.

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Number of customers to whom home heating oil, gasoline and diesel fuel were sold on a delivery only basis.

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Date the original debt was scheduled to mature, in CCYY-MM-DD format.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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