XML 50 R78.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Business Information - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 bargaining_unit | Sep. 30, 2019 USD ($) segment employee bargaining_unit | Sep. 30, 2018 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segments | segment |  | 1 |
Identifiable assets |  | $ 46,641 | $ 52,654
Number of employees represented by separate collective bargaining agreements | employee |  | 195 |
Number of collective bargain agreements | bargaining_unit |  | 2 |
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Identifiable assets |  | $ 35,079 | 29,595
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Identifiable assets |  | 11,562 | 23,059
Maniago |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Identifiable assets |  | $ 20,986 | $ 33,507
Sales Revenue, Net | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of concentration risk |  | 72.00% | 69.00%
Sales Revenue, Net | Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of concentration risk |  | 15.00% | 19.00%
Sales Revenue, Net | Asia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of concentration risk |  | 6.00% | 7.00%
Subsequent event |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of units entered into early negotiations and ratification of CBA | bargaining_unit | 2 |  |

X
- Definition Number Of Units, Early Negotiations And Ratification For Collective Bargaining Agreements + References No definition available. + Details
Name: | sif_NumberOfUnitsEarlyNegotiationsAndRatificationForCollectiveBargainingAgreements
Namespace Prefix: | sif_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Collective Bargain Units + References No definition available. + Details
Name: | sif_NumberofCollectiveBargainUnits
Namespace Prefix: | sif_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Employees Represented by Separate Collective Bargaining Units + References No definition available. + Details
Name: | sif_NumberofEmployeesRepresentedbySeparateCollectiveBargainingUnits
Namespace Prefix: | sif_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
Name: | us-gaap_NoncurrentAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=sif_ManiagoReportingUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |