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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | $ 543,063 | $ 699,582 | $ 1,052,008 | $ 1,234,609
Home heating oil and propane |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 413,466 | 554,364 | 756,812 | 918,566
Other petroleum products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 67,809 | 83,036 | 157,151 | 177,541
Petroleum products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 481,275 | 637,400 | 913,963 | 1,096,107
Equipment installations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 20,158 | 20,384 | 50,723 | 50,367
Equipment maintenance service contracts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 27,764 | 26,678 | 55,672 | 54,997
Billable call services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 13,866 | 15,120 | 31,650 | 33,138
Installations and services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | $ 61,788 | $ 62,182 | $ 138,045 | $ 138,502

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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