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Business Information - Narrative (Details)	9 Months Ended
	Jun. 30, 2025 bargaining_unit
Segment Reporting [Abstract]
Number of units entered into early negotiations and ratification of CBA	2

X

- Definition

Number Of Units, Early Negotiations And Ratification For Collective Bargaining Agreements

+ References

No definition available.

+ Details

Name:	sif_NumberOfUnitsEarlyNegotiationsAndRatificationForCollectiveBargainingAgreements
Namespace Prefix:	sif_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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