Retirement Benefit Plans (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Retirement Benefit Plans (Textual) [Abstract]
Employer contributions	$ 1,015	$ 698
Retirement Benefit Plans (Additional Textual) [Abstract]
Contributions amount in defined benefit pension plans	1,015	698
Amortization period of losses utilized under pension fund	30 years
Percentage of non-discretionary regular matching contribution of company	100.00%
Percentage of deferral contribution	1.00%
Percentage of eligible compensation	80.00%
Percentage of eligible compensation of deferral contribution, minimum	1.00%
Percentage of eligible compensation of deferral contribution, maximum	6.00%
Matching contribution expense for defined contribution plan	607	343
Additional discretionary matching contribution expense	71	185
Foreign Subsidiary One [Member]
Retirement Benefit Plans (Textual) [Abstract]
Company's annual contribution towards eligible employees compensation, percentage	5.00%
Total contribution expense towards eligible employees compensation, United Kingdom subsidiary	21	20
Foreign Subsidiary Two [Member]
Retirement Benefit Plans (Textual) [Abstract]
Total contribution expense towards eligible employees compensation, Swedish subsidiary	$ 9	$ 6

Amortization period of losses utilized under pension fund.

No definition available.

Name:	sif_AmortizationPeriodOfLossesUtilizedUnderPensionFund
Namespace Prefix:	sif_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Contribution expense subsidiary one.

+ References

No definition available.

+ Details

Name:	sif_ContributionExpenseSubsidiaryOne
Namespace Prefix:	sif_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contribution expense subsidiary two.

+ References

No definition available.

+ Details

Name:	sif_ContributionExpenseSubsidiaryTwo
Namespace Prefix:	sif_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of deferral participant contribution.

+ References

No definition available.

+ Details

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

- Definition

Percentage of eligible compensation for deferral participant contribution.

+ References

No definition available.

+ Details

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

- Definition

Percentage of eligible compensation of deferral contribution, maximum.

+ References

No definition available.

+ Details

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

- Definition

Percentage of eligible compensation of deferral contribution minimum.

+ References

No definition available.

+ Details

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

- Details

Name:	sif_RetirementBenefitPlansAdditionalTextualAbstract
Namespace Prefix:	sif_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	sif_RetirementBenefitPlansTextualAbstract
Namespace Prefix:	sif_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

+ Details

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

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

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