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Note 15 - Business Unit Segment Information (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 27, 2014
Dec. 29, 2012
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Mar. 30, 2013
Dec. 29, 2012
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Number of Operating Segments     3us-gaap_NumberOfOperatingSegments                  
Business Combination, Acquisition Related Costs $ 300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts   $ 500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 1,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 900,000us-gaap_BusinessCombinationAcquisitionRelatedCosts              
Asset Impairment Charges 300,000us-gaap_AssetImpairmentCharges     0us-gaap_AssetImpairmentCharges 500,000us-gaap_AssetImpairmentCharges              
Pension Expense   5,300,000us-gaap_PensionExpense                    
Impairment And Equity In Net Loss Of Unconsolidated Affiliate        [1] 10,678,000lfus_ImpairmentAndEquityInNetLossOfUnconsolidatedAffiliate [1] 7,334,000lfus_ImpairmentAndEquityInNetLossOfUnconsolidatedAffiliate [1]              
Selling, General and Administrative Expenses [Member] | Other Segments [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Asset Impairment Charges     100,000us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		                  
Selling, General and Administrative Expenses [Member] | SymCom, Inc. [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Business Combination, Acquisition Related Costs     400,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		                  
Selling, General and Administrative Expenses [Member] | Hamlin, Inc. [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Business Combination, Acquisition Related Costs       1,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		                
Selling, General and Administrative Expenses [Member] | Accel and Terra Power [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Business Combination, Acquisition Related Costs         1,000,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_AccelandTerraPowerMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		              
Selling, General and Administrative Expenses [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Severance Costs     500,000us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		                  
Legal Fees     2,200,000us-gaap_LegalFees
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		                  
Asset Impairment Charges     300,000us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		   500,000us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		              
Pension Expense         5,100,000us-gaap_PensionExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		              
Cost of Sales [Member] | SymCom, Inc. [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Non-cash Charges Related to Inventory Step-up     2,800,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		                  
Cost of Sales [Member] | Hamlin, Inc. [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Non-cash Charges Related to Inventory Step-up       1,500,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		                
Cost of Sales [Member] | Accel and Terra Power [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Non-cash Charges Related to Inventory Step-up         600,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_AccelandTerraPowerMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		              
Cost of Sales [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Severance Costs     2,700,000us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		                  
Research and Development Expense [Member] | Other Segments [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Asset Impairment Charges     200,000us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		                  
Shocking [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Other than Temporary Impairment Losses, Investments         3,300,000us-gaap_ImpairmentOfInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lfus_ShockingMember		 10,700,000us-gaap_ImpairmentOfInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lfus_ShockingMember		            
Impairment And Equity In Net Loss Of Unconsolidated Affiliate             7,300,000lfus_ImpairmentAndEquityInNetLossOfUnconsolidatedAffiliate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lfus_ShockingMember		          
SymCom, Inc. [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Business Combination, Acquisition Related Costs               200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		        
Non-cash Charges Related to Inventory Step-up               1,400,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		 1,400,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		      
Severance Costs               2,000,000us-gaap_SeveranceCosts1
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		        
Hamlin, Inc. [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Business Combination, Acquisition Related Costs                   200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		 300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		 1,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
Non-cash Charges Related to Inventory Step-up               $ 500,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		     $ 300,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		 $ 1,700,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | Outside the United States [Member]                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Concentration Risk, Percentage     63.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= lfus_OutsideUnitedStatesMember		                  
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | CHINA                        
Note 15 - Business Unit Segment Information (Details) [Line Items]                        
Concentration Risk, Percentage     22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CN		                  
[1] During the first quarter of 2013, the company recorded approximately $10.7 million related to the impairment of Shocking Technologies. During the fourth quarter of 2012, the company recorded approximately $7.3 million related to the impairment and equity in net loss of its investment in Shocking Technologies (See Note 6).