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Revenue Recognition - Additional Information (Detail) - USD ($) | 6 Months Ended |
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Mar. 31, 2019 | Sep. 30, 2018
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 |
Contract liabilities | 82,500,000 | $ 118,600,000
Contract with customer liability, revenue recognized | 90,300,000 |
Prepaid Expense and Other Current Assets |  |
Revenue Recognition [Line Items] |  |
Deferred contract costs,current | 3,600,000 |
Deferred Charges and Other Assets, Net |  |
Revenue Recognition [Line Items] |  |
Deferred contract costs,non current | $ 6,600,000 |
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 | 33.00% |

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- Definition 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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