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Retirement Benefit Plans - Narrative (Details) - USD ($)	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Retirement Benefits [Abstract]
Cash contribution	$ 175,000	$ 32,000
Non-cash contribution	0	$ 87,000
Additional cash contributions planned for fiscal 2025	$ 121,000

X

- Definition

Defined Benefit Plan, Plan Assets, Cash Contribution

+ References

No definition available.

+ Details

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

X

- Definition

Defined Benefit Plan, Plan Assets, Non Cash Contribution

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-7

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

+ Details

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Data Type:	xbrli:monetaryItemType
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