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

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- Details
Name: | sif_GovernmentGrantsTextualAbstract
Namespace Prefix: | sif_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unamortized portion of deferred grant revenue recorded in other long-term liabilities. + References No definition available. + Details
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Namespace Prefix: | sif_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant