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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 20, 2015 | Mar. 27, 2015 | Mar. 31, 2015 | Mar. 31, 2014 | Apr. 28, 2015 | Nov. 04, 2014 | Apr. 22, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  | $ 3.6 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 0 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |
Payments of Ordinary Dividends, Common Stock |  | 3.8 us-gaap_PaymentsOfDividendsCommonStock | 3.8 us-gaap_PaymentsOfDividendsCommonStock | 0 us-gaap_PaymentsOfDividendsCommonStock |  |  |
Cash dividends declared per common share | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.00 us-gaap_CommonStockDividendsPerShareDeclared |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | 75.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | 15.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  | $ 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax | $ (0.1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax |  |  |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share |  |  |  |  | $ 0.06 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
April 2014 Repurchase Program |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 233,637 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = fss_April2014RepurchaseProgramMember |  |  |  |
November 2014 Repurchase Program |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 0 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = fss_November2014RepurchaseProgramMember |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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