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Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 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 nine months ended June 30, 2021 and June 30, 2020:
| Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
(in thousands) | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Petroleum Products: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Home heating oil and propane | $ | 111,451 |  |  | $ | 120,951 |  |  | $ | 818,664 |  |  | $ | 877,763 |
Other petroleum products |  | 93,594 |  |  |  | 44,231 |  |  |  | 226,084 |  |  |  | 201,382 |
Total petroleum products |  | 205,045 |  |  |  | 165,182 |  |  |  | 1,044,748 |  |  |  | 1,079,145 |
Installations and Services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equipment installations |  | 28,525 |  |  |  | 21,548 |  |  |  | 81,450 |  |  |  | 72,271 |
Equipment maintenance service contracts |  | 32,196 |  |  |  | 32,541 |  |  |  | 86,109 |  |  |  | 88,213 |
Billable call services |  | 17,334 |  |  |  | 12,884 |  |  |  | 48,228 |  |  |  | 44,534 |
Total installations and services |  | 78,055 |  |  |  | 66,973 |  |  |  | 215,787 |  |  |  | 205,018 |
Total Sales | $ | 283,100 |  |  | $ | 232,155 |  |  | $ | 1,260,535 |  |  | $ | 1,284,163 |
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 |  | 622 |
Write-offs, net and other |  | (831 | )
Balance as of June 30, 2021 | $ | 5,912 |

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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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