Line Of Credit Facility, Accordion Feature, Increase Limit

No definition available.

Name:	sif_LineOfCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	sif_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility, Assets Used As Collateral, Percent

+ References

No definition available.

+ Details

Name:	sif_LineOfCreditFacilityAssetsUsedAsCollateralPercent
Namespace Prefix:	sif_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock of foreign subsidiaries percentage pledged.

+ References

No definition available.

+ Details

Name:	sif_StockOfForeignSubsidiariesPercentagePledged
Namespace Prefix:	sif_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

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

- 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

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

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of the required periodic payments of both interest and principal.

+ References

+ Details

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

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sif_CreditAgreementAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sif_CreditFacilityTermAxis=sif_TermOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sif_CreditFacilityTermAxis=sif_TermTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sif_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sif_CreditAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
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Period Type:

Long-Term Debt - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 26, 2015	Oct. 31, 2011	Jun. 30, 2015	Jun. 30, 2015	Jan. 01, 2016
Revolving loan
Debt Instrument [Line Items]
Credit agreement, maximum borrowing amount		$ 30,000,000
Credit Agreement Amendment
Debt Instrument [Line Items]
Percentage of stock of non-U.S. subsidiaries pledged		65.00%
Credit Agreement Amendment \| Revolving loan
Debt Instrument [Line Items]
Credit agreement, maximum borrowing amount		$ 40,000,000
Credit Agreement Amendment \| Revolving loan \| Credit Facility Term One
Debt Instrument [Line Items]
Credit agreement, maximum borrowing amount		$ 10,000,000
Debt instrument, term		5 years
Credit Agreement Amendment \| Revolving loan \| Credit Facility Term Two
Debt Instrument [Line Items]
Credit agreement, maximum borrowing amount		$ 30,000,000
Debt instrument, term		5 years
Credit Agreement Amendment \| Term loan
Debt Instrument [Line Items]
Quarterly installments payment		$ 500,000
Credit And Security Agreement
Debt Instrument [Line Items]
Percentage of stock pledged	65.00%
Quarterly payment	$ 714,000
Accordion feature, increase	15,000,000
Libor-based variable interest rate of term loan			5.00%	5.00%
Debt issuance costs			$ 724,000	$ 724,000
Credit And Security Agreement \| Minimum
Debt Instrument [Line Items]
Commitment fee				0.15%
Credit And Security Agreement \| Maximum
Debt Instrument [Line Items]
Commitment fee				0.35%
Credit And Security Agreement \| Revolving loan
Debt Instrument [Line Items]
Credit agreement, maximum borrowing amount	$ 25,000,000
Debt instrument, term	5 years
Debt issuance costs				$ 402,000
Credit And Security Agreement \| Revolving loan \| Forecast [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing amount					$ 20,000,000
Credit And Security Agreement \| Term loan
Debt Instrument [Line Items]
Debt instrument, term	5 years
Debt instrument, amount	$ 20,000,000
Debt issuance costs				$ 322,000