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Revenue Recognition (Tables) | 3 Months Ended
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Dec. 31, 2021
Revenue From Contract With Customer [Abstract] |
Summary of Disaggregation of Revenue by Major Sources | The following disaggregates our revenue by major sources for the three months ended December 31, 2021 and December 31, 2020:
|  | Three Months Ended December 31, |
(in thousands) |  | 2021 |  |  | 2020 |
Petroleum Products: |  |  |  |  |  |  |  |
Home heating oil and propane |  | $ | 305,723 |  |  | $ | 240,812 |
Other petroleum products |  |  | 105,542 |  |  |  | 59,520 |
Total petroleum products |  |  | 411,265 |  |  |  | 300,332 |
Installations and Services: |  |  |  |  |  |  |  |
Equipment installations |  |  | 33,069 |  |  |  | 30,060 |
Equipment maintenance service contracts |  |  | 26,977 |  |  |  | 26,868 |
Billable call services |  |  | 16,959 |  |  |  | 16,060 |
Total installations and services |  |  | 77,005 |  |  |  | 72,988 |
Total Sales |  | $ | 488,270 |  |  | $ | 373,320 |
Summary of Changes in Allowance for Credit Losses | Changes in the allowance for credit losses are as follows:
(in thousands) | Credit Loss Allowance |
Balance at September 30, 2021 | $ | 4,779 |
Current period provision |  | (288 | )
Write-offs, net and other |  | 171 |
Balance as of December 31, 2021 | $ | 4,662 |

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