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Revenue Recognition (Tables) | 3 Months Ended
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Dec. 31, 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 three months ended December 31, 2020 and December 31, 2019:
| Three Months Ended December 31, |
(in thousands) | 2020 |  |  | 2019 |
Petroleum Products: |  |  |  |  |  |  |
Home heating oil and propane | $ | 240,812 |  |  | $ | 343,346 |
Other petroleum products |  | 59,520 |  |  |  | 89,342 |
Total petroleum products |  | 300,332 |  |  |  | 432,688 |
Installations and Services: |  |  |  |  |  |  |
Equipment installations |  | 30,060 |  |  |  | 30,565 |
Equipment maintenance service contracts |  | 26,868 |  |  |  | 27,908 |
Billable call services |  | 16,060 |  |  |  | 17,784 |
Total installations and services |  | 72,988 |  |  |  | 76,257 |
Total Sales | $ | 373,320 |  |  | $ | 508,945 |
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, 2020 | $ | 6,121 |
Current period provision |  | (476 | )
Write-offs, net and other |  | (460 | )
Balance at December 31, 2020 | $ | 5,185 |

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