Restructuring Costs (Details) $ in Thousands	12 Months Ended
Sep. 30, 2017 USD ($)
Restructuring and Related Activities [Abstract]
Workforce reduction costs incurred	$ 215
Workforce reduction costs paid	$ 15

Restructuring Costs, Workforce Reduction Costs Incurred

No definition available.

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