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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, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total sales	$ 296,644	$ 439,101	$ 782,543	$ 488,270	$ 236,551	$ 283,100	$ 604,115	$ 373,320	$ 2,006,558	$ 1,497,086	$ 1,467,458
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales									1,170,552	881,526	924,421
Motor fuel and other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales									527,729	322,793	261,605
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales									1,698,281	1,204,319	1,186,026
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales									121,023	110,475	101,699
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales									121,623	118,546	120,388
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales									65,631	63,746	59,345
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales									$ 308,277	$ 292,767	$ 281,432

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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