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Condensed Financial Information of Registrant Statements of Cash Flows (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
STAR GROUP, L.P.
Condensed Cash Flow Statements, Captions [Line Items]
Includes distributions from subsidiaries	$ 54,005	$ 66,272	$ 62,877

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