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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Total sales | $ 535,027 | $ 436,834
Home heating oil and propane |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | 364,202 | 301,468
Other petroleum products |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | 94,505 | 65,266
Petroleum products |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | 458,707 | 366,734
Equipment installations |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | 29,983 | 27,344
Equipment maintenance service contracts |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | 28,319 | 25,397
Billable call services |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | 18,018 | 17,359
Installations and services |  |
Disaggregation Of Revenue [Line Items] |  |
Total sales | $ 76,320 | $ 70,100

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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