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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash, cash equivalents, and restricted cash | $ 22,335,000 | $ 17,932,000 |  | $ 14,870,000 | $ 5,017,000
Cash and cash equivalents | 22,085,000 |  |  | 14,620,000 |
Restricted cash | 250,000 |  |  | 250,000 |
Accrued expenses and other current liabilities | 162,999,000 |  |  | 125,561,000 |
Other long-term liabilities | 15,395,000 |  |  | 14,766,000 |
Weather hedge contract receivable | 12,500,000 |  |  | 0 |
Interest Rate Swap Agreements | Cash Flow Hedging Derivatives |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash flow hedging derivatives, amount | 51,500,000 |  |  |  |
Propane Assets | Goodwill |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Assets held-for-sale |  |  |  | 2,200,000 |
Propane Assets | Property and Equipment, Net |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Assets held-for-sale |  |  |  | 800,000 |
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 | 16,100,000 |  |  | 16,200,000 |
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 | 20,600,000 |  |  | $ 20,200,000 |
Financial Products Corporation |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Delivery and branch expense increased (reduced) under weather hedge contract | $ 12,500,000 | $ (1,100,000) |  |  |
Scenario Forecast |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative maximum payout |  |  | $ 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 |  |  |  |

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