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Condensed Financial Information of Registrant Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Cash flows provided by operating activities: |  |  |
Net cash provided by operating activities | $ 70,950 | $ 110,978 | $ 123,658
Cash flows provided by investing activities: |  |  |
Net cash provided by investing activities | (99,854) | (61,185) | (28,197)
Cash flows used in financing activities: |  |  |
Distributions | (26,116) | (25,038) | (23,744)
Unit repurchase | (15,595) | (11,088) | (4,475)
Net cash (used in) provided by financing activities | (63,748) | 22,351 | (64,890)
Net increase (decrease) in cash | (92,652) | 72,144 | 30,571
Cash and cash equivalents at beginning of period | 117,335 |  |
Cash and cash equivalents at end of period | 24,683 | 117,335 |
STAR GROUP, L.P. |  |  |
Cash flows provided by operating activities: |  |  |
Net cash provided by operating activities | 41,712 | 36,125 | 28,219
Cash flows provided by investing activities: |  |  |
Net cash provided by investing activities | 0 | 0 | 0
Cash flows used in financing activities: |  |  |
Distributions | (26,116) | (25,038) | (23,744)
Unit repurchase | (15,595) | (11,088) | (4,475)
Net cash (used in) provided by financing activities | (41,711) | (36,126) | (28,219)
Net increase (decrease) in cash | 1 | (1) | 0
Cash and cash equivalents at beginning of period | 40 | 41 | 41
Cash and cash equivalents at end of period | $ 41 | $ 40 | $ 41

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