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Revenue Recognition - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenue Recognition [Line Items]
Revenue, practical expedient, incremental cost of obtaining contract [true false]		true
Contract costs, amortization period	5 years
Contract costs, impairment loss	$ 0	$ 0	$ 0
Contract liabilities	152,100,000	141,600,000
Contract with customer liability, revenue recognized	130,400,000	128,500,000
Prepaid Expense and Other Current Assets
Revenue Recognition [Line Items]
Deferred contract costs,current	3,400,000	3,400,000
Deferred Charges and Other Assets, Net
Revenue Recognition [Line Items]
Deferred contract costs,non current	5,600,000	5,700,000
Delivery and Branch Expenses
Revenue Recognition [Line Items]
Amortization of deferred contract costs	$ 3,900,000	$ 3,900,000
Maximum
Revenue Recognition [Line Items]
Contract liabilities recognition service contract period	1 year
Equipment Maintenance Service Contracts | Maximum
Revenue Recognition [Line Items]
Revenue from service contracts period of recognition	1 year
Residential and Commercial Home Heating Oil Customers
Revenue Recognition [Line Items]
Percentage of customers receiving deliveries based on prevailing weather conditions	95.00%
Residential Customers
Revenue Recognition [Line Items]
Customer payment terms	30 days
Percentage of customers take advantage of smart pay budget payment plan	32.00%

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Percentage of customers take advantage of smart pay budget payment plan.

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
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Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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