Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012
Effects of mark-to-market valuation of interest rate swap agreement
Interest rate swap agreement market value adjustment	$ (93)
Tax effect of interest rate swap agreement market value adjustment	35
Net interest rate swap agreement market value adjustment	$ (58)

Tax effect of interest rate swap agreement market adjustment.

No definition available.

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