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Revenue Recognition - Additional Information (Detail) - USD ($) | 12 Months Ended
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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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- 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) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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- Definition Amount of impairment loss 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) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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