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v3.25.1

Business Information - Narrative (Details) | 6 Months Ended
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Mar. 31, 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