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Revenue Recognition (Tables) | 6 Months Ended
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Mar. 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 and six months ended March 31, 2021 and March 31, 2020:
| Three Months Ended March 31, |  |  | Six Months Ended March 31, |
(in thousands) | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Petroleum Products: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Home heating oil and propane | $ | 466,401 |  |  | $ | 413,466 |  |  | $ | 707,213 |  |  | $ | 756,812 |
Other petroleum products |  | 72,970 |  |  |  | 67,809 |  |  |  | 132,490 |  |  |  | 157,151 |
Total petroleum products |  | 539,371 |  |  |  | 481,275 |  |  |  | 839,703 |  |  |  | 913,963 |
Installations and Services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equipment installations |  | 22,865 |  |  |  | 20,158 |  |  |  | 52,925 |  |  |  | 50,723 |
Equipment maintenance service contracts |  | 27,045 |  |  |  | 27,764 |  |  |  | 53,913 |  |  |  | 55,672 |
Billable call services |  | 14,834 |  |  |  | 13,866 |  |  |  | 30,894 |  |  |  | 31,650 |
Total installations and services |  | 64,744 |  |  |  | 61,788 |  |  |  | 137,732 |  |  |  | 138,045 |
Total Sales | $ | 604,115 |  |  | $ | 543,063 |  |  | $ | 977,435 |  |  | $ | 1,052,008 |
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 |  | 256 |
Write-offs, net and other |  | (580 | )
Balance as of March 31, 2021 | $ | 5,797 |

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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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