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Condensed Financial Information of Registrant Statements of Cash Flows (Parenthetical) (Detail) (STAR GAS PARTNERS, L.P., USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
STAR GAS PARTNERS, L.P. |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Includes distributions from subsidiaries | $ 21,513 | $ 34,530 | $ 39,173

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