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Inventories - Additional Information (Detail) - gal gal in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Inventory [Line Items]
Heating oil and other fuel inventories	22.8	16.3
Maximum product supply by other supplier	10.00%	10.00%
Home heating oil and propane
Inventory [Line Items]
Market based product supply contracts for next twelve months	271.6
Diesel and gasoline
Inventory [Line Items]
Market based product supply contracts for next twelve months	44.4

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- Definition

Heating Oil And Other Fuel Inventories

+ References

No definition available.

+ Details

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- Definition

Market based product supply contracts in gallons.

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No definition available.

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- Definition

Maximum 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.

+ Details

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- Details

Name:	srt_EnergyAxis=sgu_HomeHeatingOilAndPropaneMember
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Period Type:

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- Details

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