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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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