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Debt - Summary of Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent		$ 47.0	$ 50.2
Long term debt and capital lease obligations		6.5	6.2
Long-term Debt
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent	[1]	47.0	50.2
Long-term Debt, Fair Value	[1]	$ 47.0	$ 50.2
[1] Long-term borrowings includes current portions of long-term debt and current portions of capital lease obligations of $6.5 million and $6.2 million as of September 30, 2015 and December 31, 2014, respectively.

X

- Definition

Carrying Amounts and Fair Values of Financial Instruments [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	fss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	fss_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
Namespace Prefix:	fss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

Reference 1: 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)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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