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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | $ 305,618 | $ 331,640 | $ 1,536,726 | $ 1,525,768
Home heating oil and propane |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 136,146 | 155,161 | 1,046,864 | 1,014,530
Other petroleum products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 80,012 | 93,840 | 233,858 | 278,319
Petroleum products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 216,158 | 249,001 | 1,280,722 | 1,292,849
Equipment installations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 33,317 | 30,143 | 100,082 | 90,682
Equipment maintenance service contracts |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 36,888 | 35,164 | 98,863 | 93,466
Billable call services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | 19,255 | 17,332 | 57,059 | 48,771
Installations and services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total sales | $ 89,460 | $ 82,639 | $ 256,004 | $ 232,919

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