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Condensed Financial Information of Registrant Statements of Cash Flows (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
STAR GROUP, L.P.
Condensed Cash Flow Statements, Captions [Line Items]
Includes distributions from subsidiaries	$ 24,052	$ 35,109	$ 152,537

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- Definition

Distribution From Subsidiaries

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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