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Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2025
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, 2025, 2024 and 2023:
| Years Ended September 30, |
(in thousands) | 2025 |  |  | 2024 |  |  | 2023 |
Petroleum Products: |  |  |  |  |  |  |  |
Home heating oil and propane | $ | 1,119,777 |  |  | $ | 1,081,985 |  |  | $ | 1,202,194 |
Motor fuel and other petroleum products |  | 317,824 |  |  |  | 366,807 |  |  |  | 448,547 |
Total petroleum products |  | 1,437,601 |  |  |  | 1,448,792 |  |  |  | 1,650,741 |
Installations and Services: |  |  |  |  |  |  |  |
Equipment installations |  | 135,149 |  |  |  | 123,493 |  |  |  | 114,756 |
Equipment maintenance service contracts |  | 136,042 |  |  |  | 129,478 |  |  |  | 126,887 |
Billable call services |  | 75,626 |  |  |  | 64,336 |  |  |  | 60,478 |
Total installations and services |  | 346,817 |  |  |  | 317,307 |  |  |  | 302,121 |
Total Sales | $ | 1,784,418 |  |  | $ | 1,766,099 |  |  | $ | 1,952,862 |
Summary of Changes in Allowance for Credit Losses | Changes in the allowance for credit losses are as follows:
(in thousands) | Credit Loss Allowance |
Balance as of September 30, 2024 | $ | 6,434 |
Current period provision |  | 6,879 |
Write-offs, net and other |  | (6,117 | )
Balance as of September 30, 2025 | $ | 7,196 |

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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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