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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  |  | 12 Months Ended |
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Oct. 31, 2024 | Aug. 31, 2024 USD ($) | Aug. 31, 2023 USD ($) | Aug. 31, 2022 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) Segment | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash, cash equivalents, and restricted cash |  |  |  |  |  | $ 117,585,000 | $ 45,441,000 | $ 14,870,000 | $ 5,017,000
Cash and cash equivalents |  |  |  |  |  | 117,335,000 | 45,191,000 |  |
Restricted cash |  |  |  |  |  | $ 250,000 | 250,000 |  |
Number of reportable segments | Segment |  |  |  |  |  | 1 |  |  |
Goodwill impairment |  | $ 0 | $ 0 | $ 0 |  |  |  |  |
Minimum percentage of likelihood on goodwill impairment | 50.00% |  |  |  |  |  |  |  |
Advertising expenses |  |  |  |  |  | $ 15,000,000 | 13,500,000 | 13,000,000 |
Description of uncertain tax position |  |  |  |  |  | greater than 50% |  |  |
Derivative maximum payout |  |  |  |  |  |  | 5,000,000 | 5,000,000 |
Scenario Forecast |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Derivative maximum receivable |  |  |  |  | $ 15,000,000 |  |  |  |
Derivative maximum payout |  |  |  |  | $ 5,000,000 |  |  |  |
Financial Products Corporation |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Delivery and branch expense reduced under weather hedge contract |  |  |  |  |  | $ 7,500,000 | $ 12,500,000 | $ 1,100,000 |
Maximum |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents, highly liquid investments maturity |  |  |  |  |  | 3 months |  |  |
Derivative maximum receivable |  |  |  |  |  | $ 12,500,000 |  |  |
Maximum | Customer Lists |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets, amortization period |  |  |  |  |  | 10 years |  |  |
Maximum | Trade Names |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets, amortization period |  |  |  |  |  | 20 years |  |  |
Maximum | Land Improvements |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 20 years |  |  |
Maximum | Buildings and leasehold improvements |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 30 years |  |  |
Maximum | Fleet and Other Equipment |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 15 years |  |  |
Maximum | Tanks and Equipment |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 10 years |  |  |
Maximum | Furniture, Fixtures and Office Equipment |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 10 years |  |  |
Minimum | Customer Lists |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets, amortization period |  |  |  |  |  | 7 years |  |  |
Minimum | Trade Names |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets, amortization period |  |  |  |  |  | 3 years |  |  |
Minimum | Land Improvements |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 10 years |  |  |
Minimum | Buildings and leasehold improvements |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 5 years |  |  |
Minimum | Fleet and Other Equipment |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 1 year |  |  |
Minimum | Tanks and Equipment |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 3 years |  |  |
Minimum | Furniture, Fixtures and Office Equipment |  |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  | 5 years |  |  |

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