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Long-Term Borrowings (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total long-term borrowings and capital lease obligations	$ 50.2fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent	$ 92.1fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
Less: Current maturities	5.8us-gaap_LongTermDebtCurrent	7.0us-gaap_LongTermDebtCurrent
Less: Current capital lease obligations	0.4us-gaap_CapitalLeaseObligationsCurrent	0.4us-gaap_CapitalLeaseObligationsCurrent
Total long-term borrowings and capital lease obligations, net	44.0us-gaap_LongTermDebtAndCapitalLeaseObligations	84.7us-gaap_LongTermDebtAndCapitalLeaseObligations
Revolving Credit Facility
Debt Instrument [Line Items]
Total long-term borrowings and capital lease obligations	0fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember	20.0fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Term Loan
Debt Instrument [Line Items]
Total long-term borrowings and capital lease obligations	49.2fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_CreditFacilityAxis = fss_TermLoanMember	70.8fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_CreditFacilityAxis = fss_TermLoanMember
Capital Lease Obligations
Debt Instrument [Line Items]
Total long-term borrowings and capital lease obligations	$ 1.0fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_CreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember	$ 1.3fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent / us-gaap_CreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember

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Long term debt and capital lease obligations current and non-current.

+ References

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

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-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Number Topic 6

-Section H

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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-Publisher FASB

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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