XML 61 R50.htm IDEA: XBRL DOCUMENT v3.8.0.1

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Effective tax rate	(5.30%)	41.30%
Provisional income tax benefit due to reduction in Federal corporate tax rate	$ 11,452,000
Effective income tax rate excluding impact of net deferred tax liability	34.70%
Unrecognized income tax benefits	$ 0
Federal
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
Federal | Tax Year 2017
Income Tax Disclosure [Line Items]
Corporate income tax rate	35.00%
Federal | Tax Year 2018
Income Tax Disclosure [Line Items]
Corporate income tax rate	21.00%
New York
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
Connecticut
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
Pennsylvania
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
New Jersey
Income Tax Disclosure [Abstract]
Number of years for examination	5 years

X

- Definition

Corporate income tax rate.

+ References

No definition available.

+ Details

Name:	sgu_CorporateIncomeTaxRate
Namespace Prefix:	sgu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Effective income tax rate continuing operations excluding impact of net deferred tax liability.

+ References

No definition available.

+ Details

Name:	sgu_EffectiveIncomeTaxRateContinuingOperationsExcludingImpactOfNetDeferredTaxLiability
Namespace Prefix:	sgu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	sgu_IncomeTaxDisclosureLineItems
Namespace Prefix:	sgu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax Examination, Years Open for Examination

+ References

No definition available.

+ Details

Name:	sgu_IncomeTaxExaminationYearsOpenForExamination
Namespace Prefix:	sgu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

+ Details

Name:	us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=sgu_FederalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=us-gaap_TaxYear2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=sgu_TaxYear2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=stpr_NY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=stpr_CT
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=stpr_PA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=stpr_NJ
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: