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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Mar. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs | $ 1.2 us-gaap_SeveranceCosts1 | $ 0.6 us-gaap_SeveranceCosts1 |  |
Released remaining restructuring cost |  | 0.6 fss_ReleasedofRestructuringCosts |  |
2012 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs |  |  | 0.6 us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = fss_TwoThousandAndTwelveRestructuringPlanMember | 0.9 us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = fss_TwoThousandAndTwelveRestructuringPlanMember
Safety And Security Systems | 2013 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs | 1.2 us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = fss_TwoThousandandThirteenRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = fss_SafetyAndSecuritySystemsMember |  |  |
Corporate, Non-Segment [Member] | 2013 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance costs | $ 0.3 us-gaap_SeveranceCosts1 / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_RestructuringPlanAxis = fss_TwoThousandandThirteenRestructuringPlanMember |  |  |

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- Definition Released restructuring cost. + References No definition available. + Details
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- Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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- Details
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- Details
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