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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Cash flows provided by operating activities: |  |  |
Net cash provided by operating activities | $ 33,907 | $ 68,877 | $ 175,668
Cash flows provided by investing activities: |  |  |
Net cash provided by investing activities | (32,626) | (50,326) | (28,141)
Cash flows used in financing activities: |  |  |
Distributions | (23,192) | (23,448) | (24,451)
Unit repurchase | (30,817) | (42,824) | (38,431)
Net cash provided by (used in) financing activities | 8,572 | (70,695) | (95,515)
Net decrease in cash | 9,853 | (52,144) | 52,012
Cash and cash equivalents at beginning of period | 4,767 |  |
Cash and cash equivalents at end of period | 14,620 | 4,767 |
STAR GROUP, L.P. |  |  |
Cash flows provided by operating activities: |  |  |
Net cash provided by operating activities | 54,005 | 66,272 | 62,877
Cash flows provided by investing activities: |  |  |
Net cash provided by investing activities | 0 | 0 | 0
Cash flows used in financing activities: |  |  |
Distributions | (23,192) | (23,448) | (24,451)
Unit repurchase | (30,817) | (42,824) | (38,431)
Net cash provided by (used in) financing activities | (54,009) | (66,272) | (62,882)
Net decrease in cash | (4) | (0) | (5)
Cash and cash equivalents at beginning of period | 45 | 45 | 50
Cash and cash equivalents at end of period | $ 41 | $ 45 | $ 45

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