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Condensed Financial Information of Registrant Statements of Cash Flows (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
STAR GROUP, L.P.      
Condensed Cash Flow Statements, Captions [Line Items]      
Includes distributions from subsidiaries $ 36,125 $ 28,219 $ 54,005