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Condensed Financial Information of Registrant of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Condensed Income Statements, Captions [Line Items]                      
Revenues $ 240,331 $ 331,640 $ 666,032 $ 528,096 $ 266,937 $ 300,121 $ 737,617 $ 648,187 $ 1,766,099 $ 1,952,862 $ 2,006,558
General and administrative expenses                 28,405 25,780 24,882
Operating income (48,559) (12,291) 100,331 21,621 (22,989) (29,586) 91,515 23,605 61,102 62,545 60,453
Income before income taxes (50,642) (15,201) 96,244 18,153 (26,171) (33,196) 86,294 19,002 48,554 45,929 49,026
Net income $ (35,086) $ (11,044) $ 68,374 $ 12,979 $ (19,729) $ (23,906) $ 62,041 $ 13,539 35,223 31,945 35,288
STAR GROUP, L.P.                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 0 0 0
General and administrative expenses                 1,621 1,607 1,588
Operating income                 (1,621) (1,607) (1,588)
Income before income taxes                 (1,621) (1,607) (1,588)
Equity income of Star Acquisitions Inc. and subs                 36,844 33,552 36,876
Net income                 $ 35,223 $ 31,945 $ 35,288