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Inventories - Additional Information (Detail) - gal gal in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Inventory [Line Items]
Heating oil and other fuel inventories	8.4	11.8
Shell Oil Company
Inventory [Line Items]
Percentage of product purchases from supplier	16.00%	18.00%
Motiva Enterprises LLC
Inventory [Line Items]
Percentage of product purchases from supplier	15.00%	14.00%
Home heating oil and propane
Inventory [Line Items]
Market based product supply contracts for next twelve months	180.2
Diesel and gasoline
Inventory [Line Items]
Market based product supply contracts for next twelve months	57.6

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- Definition

Heating Oil And Other Fuel Inventories

+ References

No definition available.

+ Details

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X

- Definition

Market based product supply contracts in gallons.

+ References

No definition available.

+ Details

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- Definition

Percentage of product purchases.

+ References

No definition available.

+ Details

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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.

+ Details

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- Details

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- Details

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X

- Details

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X

- Details

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