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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ 5,750,000 | $ 66,968,000 |  |  | $ 57,161,000 | $ 5,149,000
Cash and cash equivalents | 5,500,000 |  |  |  | 56,911,000 |
Restricted cash | 250,000 |  |  |  | 250,000 |
Derivative maximum payout |  |  |  |  | 5,000,000.0 |
Accrued expenses and other current liabilities | 143,893,000 |  |  |  | 127,286,000 |
Other long-term liabilities | 25,670,000 |  |  |  | 25,001,000 |
New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accrued expenses and other current liabilities | 200,000 |  |  |  | 200,000 |
Other long-term liabilities | 16,500,000 |  |  |  | 16,700,000 |
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 | 26,200,000 |  |  |  | 29,000,000.0 |
Financial Products Corporation | Delivery and branch expenses |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Benefit on weather hedge contract | $ 3,400,000 | $ 10,100,000 |  |  |  |
Scenario Forecast |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maximum payout |  |  | $ 0 | $ 5,000,000.0 |  |
Maximum |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash equivalents, highly liquid investments maturity | 3 months |  |  |  |  |
Derivative maximum receivable |  |  |  |  | $ 12,500,000 |
Maximum | Scenario Forecast |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maximum receivable |  |  | $ 7,500,000 | $ 12,500,000 |  |

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