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Note 12 - Benefit Plans (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 29, 2012
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Note 12 - Benefit Plans (Details) [Line Items]        
Pension Expense $ 5,300,000us-gaap_PensionExpense      
Defined Benefit Plan, Total Cost Credit of the Plan   300,000lfus_DefinedBenefitPlanTotalCostCreditofThePlan 800,000lfus_DefinedBenefitPlanTotalCostCreditofThePlan 5,400,000lfus_DefinedBenefitPlanTotalCostCreditofThePlan
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year   1,400,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   6.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets    
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities   11,768,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Defined Contribution Plan, Employer Discretionary Contribution Amount   2,100,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,700,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,500,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent   90.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Selling, General and Administrative Expenses [Member] | Amended Plan [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Pension Expense 5,100,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= lfus_AmendedPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
     
Selling, General and Administrative Expenses [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Pension Expense       5,100,000us-gaap_PensionExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Cost of Sales [Member] | Amended Plan [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Pension Expense 200,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= lfus_AmendedPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
     
Minimum [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
United States Pension Plan of US Entity [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Pension Expense   (613,000)us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
(253,000)us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
4,378,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan, Total Cost Credit of the Plan   (613,000)lfus_DefinedBenefitPlanTotalCostCreditofThePlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
(253,000)lfus_DefinedBenefitPlanTotalCostCreditofThePlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
(720,000)lfus_DefinedBenefitPlanTotalCostCreditofThePlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan, Accumulated Benefit Obligation   105,800,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
84,400,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
 
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   6.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
6.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
7.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities   11,768,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
   
Foreign Pension Plan [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Pension Expense   909,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
1,043,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
1,015,000us-gaap_PensionExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan, Total Cost Credit of the Plan   909,000lfus_DefinedBenefitPlanTotalCostCreditofThePlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
1,043,000lfus_DefinedBenefitPlanTotalCostCreditofThePlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
827,000lfus_DefinedBenefitPlanTotalCostCreditofThePlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan, Accumulated Benefit Obligation   48,900,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
46,200,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
 
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets   4.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
4.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Supplemental Executive Retirement Plan SERP [Member]        
Note 12 - Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Cost Recognized   $ 0us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= lfus_SupplementalExecutiveRetirementPlanSERPMember
$ 0us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= lfus_SupplementalExecutiveRetirementPlanSERPMember
$ 100,000us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= lfus_SupplementalExecutiveRetirementPlanSERPMember