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Summary of Significant Accounting Policies - Additional Information (Detail) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013
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Interest Rate Swap [Member] |  |
Accounting Policies [Line Items] |  |
Interest rate swap agreement amount | $ 4,500 | $ 6,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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