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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ 20,175,000 |  | $ 22,841,000 | $ 45,441,000 | $ 14,870,000
Cash and cash equivalents | 19,925,000 |  |  | 45,191,000 |
Restricted cash | 250,000 |  |  | 250,000 |
Derivative maximum payout |  |  |  | 5,000,000 |
Accrued expenses and other current liabilities | 118,382,000 |  |  | 115,606,000 |
Other long-term liabilities | 16,298,000 |  |  | 16,175,000 |
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 | 15,900,000 |  |  | 16,000,000.0 |
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 | 19,600,000 |  |  | $ 18,500,000 |
Financial Products Corporation |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Delivery and branch expense increased (reduced) under weather hedge contract | $ 1,000,000 | $ 12,900,000 | $ (400,000) |  |
Maximum |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash equivalents, highly liquid investments maturity | 3 months |  |  |  |
Derivative maximum receivable | $ 12,500,000 |  |  |  |

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