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Note 13 - Shareholders' Equity (Details) (USD $)
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 9,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 15,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 9,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 7,600,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 6,500,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 5,800,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 11,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 328 days    
Allocated Share-based Compensation Expense 9,400,000us-gaap_AllocatedShareBasedCompensationExpense 8,900,000us-gaap_AllocatedShareBasedCompensationExpense 7,300,000us-gaap_AllocatedShareBasedCompensationExpense
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 3,300,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 3,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax 12,587lfus_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansLiabilityAdjustmentTax 6,549lfus_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansLiabilityAdjustmentTax 11,819lfus_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansLiabilityAdjustmentTax
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax $ 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in Shares) 1,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased    
Stock Repurchased During Period, Shares (in Shares) 161,751us-gaap_StockRepurchasedDuringPeriodShares    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares) 838,249us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased    
Employee Stock Option [Member] | Granted Prior To 2002 [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 10 years    
Employee Stock Option [Member] | Granted In 2002 Through February 2005 [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 10 years    
Employee Stock Option [Member] | Granted After February 2005 [Member] | Maximum [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 10 years    
Employee Stock Option [Member] | Granted After February 2005 [Member] | Minimum [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period 7 years    
Employee Stock Option [Member] | Granted After February 2005 [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Restricted Stock [Member] | Maximum [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Restricted Stock [Member] | Minimum [Member]      
Note 13 - Shareholders' Equity (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years