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Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Dec. 29, 2013
Schedule of Deferred Tax Assets and Liabilities [Line Items]    
Net operating loss carryforwards $ 37.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 50.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Reserves and accruals 45.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 40.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Tax credit and capital allowance carryovers 77.5us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 88.2us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Plant and equipment 9.2us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 1.4us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Unrealized loss in other comprehensive income 0.8fcs_DeferredTaxAssetsUnrealizedLossInOtherComprehensiveIncome  
Total gross deferred tax assets 170.3us-gaap_DeferredTaxAssetsGross 180.0us-gaap_DeferredTaxAssetsGross
Valuation allowance (169.2)us-gaap_DeferredTaxAssetsValuationAllowance (147.6)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 1.1us-gaap_DeferredTaxAssetsNet 32.4us-gaap_DeferredTaxAssetsNet
Undistributed earnings of foreign subsidiaries (3.6)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (2.4)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Unrealized gain in other comprehensive income   (1.7)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Capitalized research expenses and intangibles (13.2)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts (6.5)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts
Total deferred tax liabilities (16.8)us-gaap_DeferredTaxLiabilities (10.6)us-gaap_DeferredTaxLiabilities
Net deferred tax assets (liabilities) $ (15.7)us-gaap_DeferredTaxAssetsLiabilitiesNet $ 21.8us-gaap_DeferredTaxAssetsLiabilitiesNet