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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Total sales	$ 240,331	$ 331,640	$ 666,032	$ 528,096	$ 266,937	$ 300,121	$ 737,617	$ 648,187	$ 1,766,099	$ 1,952,862	$ 2,006,558
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales									1,081,985	1,202,194	1,170,552
Motor fuel and other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales									366,807	448,547	527,729
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales									1,448,792	1,650,741	1,698,281
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales									123,493	114,756	121,023
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales									129,478	126,887	121,623
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales									64,336	60,478	65,631
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales									$ 317,307	$ 302,121	$ 308,277

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