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Business Combinations - Additional Information (Detail) (USD $)	6 Months Ended
	Mar. 31, 2015 PartnershipUnit	Sep. 30, 2014
Business Acquisition [Line Items]
Number of heating oil dealer acquired	1us-gaap_NumberOfBusinessesAcquired
Aggregate purchase price partnership acquired	$ 1,100,000us-gaap_BusinessCombinationConsiderationTransferred1
Gross purchase price allocation, intangible assets	300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Goodwill	209,403,000us-gaap_Goodwill	209,331,000us-gaap_Goodwill
Gross purchase price allocation, fixed assets	700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
Propane Dealer
Business Acquisition [Line Items]
Goodwill	$ 100,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = sgu_PropaneDealerMember

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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-Name Accounting Standards Codification

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

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-Paragraph 1

-Subparagraph (c)

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

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