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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2026 | Sep. 30, 2024 | Sep. 30, 2023
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ 18,752,000 | $ 12,313,000 |  | $ 117,585,000 | $ 45,441,000
Cash and cash equivalents | 18,502,000 |  |  | 117,335,000 |
Restricted cash | 250,000 |  |  | 250,000 |
Derivative maximum payout | 5,000,000 | 0 |  |  |
Accrued expenses and other current liabilities | 154,455,000 |  |  | 116,317,000 |
Other long-term liabilities | 16,007,000 |  |  | 16,273,000 |
New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accrued expenses and other current liabilities | 300,000 |  |  | 300,000 |
Other long-term liabilities | 15,500,000 |  |  | 15,700,000 |
New England Teamsters & Trucking Industry Pension Fund | Significant Other Observable Inputs Level 2 |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Multiemployer plan discounted withdrawal liability | 18,500,000 |  |  | $ 19,300,000 |
Financial Products Corporation |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Delivery and branch expense reduced under weather hedge contract | $ 3,100,000 | 7,500,000 |  |  |
Scenario Forecast |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative maximum receivable |  |  | $ 15,000,000 |  |
Derivative maximum payout |  |  | $ 5,000,000 |  |
Maximum |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash equivalents, highly liquid investments maturity | 3 months |  |  |  |
Derivative maximum receivable | $ 15,000,000 | $ 12,500,000 |  |  |

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