Government Grants (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Government Grants (Textual) [Abstract]
Unamortized portion of deferred grant revenue recorded in other long-term liabilities	$ 336	$ 375

Unamortized portion of deferred grant revenue recorded in other long-term liabilities.

No definition available.

Name:	sif_UnamortizedPortionOfDeferredGrantRevenueRecordedInOtherLongTermLiabilities
Namespace Prefix:	sif_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant