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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 72 Months Ended | 12 Months Ended | 36 Months Ended | 4 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 7 Months Ended | 10 Months Ended | 12 Months Ended | 1 Months Ended | 4 Months Ended | 1 Months Ended |  |  |  |
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Nov. 30, 2012 Plaintiff | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013 plaintiff | Dec. 31, 2008 Plaintiff | Dec. 31, 2004 plaintiff case | Dec. 31, 2010 | Dec. 31, 2009 Plaintiff Case | Apr. 22, 2011 Plaintiff | Apr. 22, 2011 | Jan. 12, 2015 Plaintiff | Dec. 31, 2009 plaintiff | Dec. 31, 2012 Plaintiff | Nov. 30, 2011 Plaintiff | Jan. 31, 2015 Case Plaintiff | Dec. 31, 2014 Plaintiff | Oct. 31, 2012 Plaintiff Case | Mar. 31, 2014 case | Jun. 30, 2014 case | Mar. 31, 2014 Plaintiff | Jul. 31, 2013 Plaintiff | Feb. 28, 2015 Plaintiff | Nov. 04, 2014 | Apr. 22, 2014 | Jan. 04, 2011 Plaintiff | Apr. 29, 2011
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 3.6 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 0 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | 15.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |
Amount outstanding standby letters of credit |  | 36.5 us-gaap_LettersOfCreditOutstandingAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves related to environmental remediation |  | 1.3 us-gaap_LiabilitiesSubjectToCompromiseEnvironmentalContingencies |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.3 us-gaap_LiabilitiesSubjectToCompromiseEnvironmentalContingencies |  |  |  |  |  |  |  |  |  |
Number of plaintiffs cases dismissed | 2 fss_LossContingencyNumberOfPlaintiffsDismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement |  | 0.1 us-gaap_ReimbursementRevenue | 0.1 us-gaap_ReimbursementRevenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty maturity periods |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latvian Commercial Case Range of Loss |  | 0 fss_LatvianCommercialCaseRangeofLoss / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty maturity periods |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latvian Commercial Case Range of Loss |  | 5.0 fss_LatvianCommercialCaseRangeofLoss / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters |  |  |  |  |  | 33 fss_NumberOfLawsuitsFiled / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  | 6 fss_NumberOfLawsuitsFiled / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  | 6 fss_NumberOfLawsuitsFiled / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  | 74 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  | 2,443 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases of plaintiff's claims |  |  |  |  | 27 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 308 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |
Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters |  |  |  |  |  |  |  | 71 fss_NumberOfLawsuitsFiled / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  | 71 fss_NumberOfLawsuitsFiled / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  | 71 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  |  |  |  |  |  |  | 3 us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases of plaintiff's claims |  |  |  |  |  |  |  | 4 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages maximum amount |  |  |  |  |  |  | 0.1 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, minimum amount |  |  |  |  |  |  | 0.08 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,125 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |
Settlement Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  | 1,069 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims settled amount |  |  |  | 3.8 fss_LossContingencyClaimsSettledAmount / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of claimants agreed for settlement |  |  |  |  |  |  |  |  | 95.02%fss_PercentageOfClaimantsAgreedForSettlement / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember | 95.02%fss_PercentageOfClaimantsAgreedForSettlement / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93.00%fss_PercentageOfClaimantsAgreedForSettlement / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember
Percentage of claimants agreed for settlement as per settlement agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%fss_PercentageOfClaimantsAgreedForSettlementAsPerSettlementAgreement / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember
Settlement Agreement payment made |  |  |  |  |  |  |  |  |  | (3.6)us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supreme Court of Kings County New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, New Claims Filed, Number |  | 4 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LitigationCaseAxis = fss_SupremeCourtofKingsCountyNewYorkMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Chicago Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  | 1,800 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_OutsideChicagoFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Chicago Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  | 1,800 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_OutsideChicagoFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  | 299 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PennsylvaniaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters |  |  |  |  |  |  |  | 40 fss_NumberOfLawsuitsFiled / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember |  |  |  | 40 fss_NumberOfLawsuitsFiled / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 3 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  | 3 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember | 8 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  | 9 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  | 40 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plaintiff's counsel later moved to reduce the number of plaintiff |  |  |  |  |  |  |  |  |  |  |  | 9 fss_LossContingencyNumberOfPlaintiffsReduced / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims settled amount |  |  |  |  |  |  |  |  |  |  |  | 0.4 fss_LossContingencyClaimsSettledAmount / us-gaap_CounterpartyNameAxis = fss_ChicagoFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Philadelphia Firefighter Plaintiffs | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 fss_NumberOfLawsuitsFiled / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  | 9 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  | 70 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember | 3 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember | 20 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |
Loss Contingency, New Claims Filed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Cases Scheduled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 fss_LossContingencyNumberofCasesScheduled / us-gaap_CounterpartyNameAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |
District of Columbia Firefighter Plaintiffs | Federal Court, Eastern District of Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_DistrictofColumbiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_FederalCourtEasternDistrictofPennsylvaniaMember |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, New Claims Filed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_CounterpartyNameAxis = fss_DistrictofColumbiaFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_FederalCourtEasternDistrictofPennsylvaniaMember |  |  |  |  |  |  |  |  |  |  |
Pittsburgh Firefighter Plaintiffs | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PittsburghFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_CounterpartyNameAxis = fss_PittsburghFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |
Pittsburgh Firefighter Plaintiffs | Allegheny County, Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 247 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_PittsburghFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_AlleghenyCountyPennsylvaniaMember |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41 us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_CounterpartyNameAxis = fss_PittsburghFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_AlleghenyCountyPennsylvaniaMember |  |  |  |  |
Buffalo Firefighter Plaintiffs | Supreme Court of State of New York Erie County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  | 193 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_BuffaloFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_SupremeCourtofStateofNewYorkErieCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, New Claims Filed, Number |  | 20 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_CounterpartyNameAxis = fss_BuffaloFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_SupremeCourtofStateofNewYorkErieCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New York City Firefighter Plaintiffs | Supreme Court of State of New York, New York County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_CounterpartyNameAxis = fss_NewYorkCityFirefighterPlaintiffsMember / us-gaap_LitigationCaseAxis = fss_SupremeCourtofStateofNewYorkNewYorkCountyMember |  |  |  |

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