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Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2020
Revenue From Contract With Customer [Abstract] |
Summary of Disaggregation of Revenue by Major Sources | The following disaggregates our revenue by major sources for the years ended September 30, 2020, 2019 and 2018:
| Years Ended September 30, |
(in thousands) | 2020 |  |  | 2019 |  |  | 2018 |
Petroleum Products: |  |  |  |  |  |  |  |  |  |  |
Home heating oil and propane | $ | 924,421 |  |  | $ | 1,099,874 |  |  | $ | 1,084,827 |
Motor fuel and other petroleum products |  | 261,605 |  |  |  | 366,172 |  |  |  | 319,543 |
Total petroleum products |  | 1,186,026 |  |  |  | 1,466,045 |  |  |  | 1,404,370 |
Installations and Services: |  |  |  |  |  |  |  |  |  |  |
Equipment installations |  | 101,699 |  |  |  | 101,709 |  |  |  | 98,064 |
Equipment maintenance service contracts |  | 120,388 |  |  |  | 120,138 |  |  |  | 111,361 |
Billable call services |  | 59,345 |  |  |  | 65,980 |  |  |  | 64,042 |
Total installations and services |  | 281,432 |  |  |  | 287,827 |  |  |  | 273,467 |
Total Sales | $ | 1,467,458 |  |  | $ | 1,753,872 |  |  | $ | 1,677,837 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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