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Inventories - Additional Information (Detail) - gal gal in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Inventory [Line Items]
Heating oil and other fuel inventories	11.8	15.8
Shell Oil Company
Inventory [Line Items]
Percentage of product purchases from supplier	18.00%
Motiva Enterprises LLC
Inventory [Line Items]
Percentage of product purchases from supplier	14.00%	14.00%
Global Companies LLC
Inventory [Line Items]
Percentage of product purchases from supplier		17.00%
Home heating oil and propane
Inventory [Line Items]
Market based product supply contracts for next twelve months	182.9
Diesel and gasoline
Inventory [Line Items]
Market based product supply contracts for next twelve months	60.5

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- Definition

Heating Oil And Other Fuel Inventories

+ References

No definition available.

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- Definition

Market based product supply contracts in gallons.

+ References

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- Definition

Percentage of product purchases.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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