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Note 4 - Goodwill and Other Intangible Assets (Details) (USD $)
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Note 4 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Acquired During Period $ 16,574,000us-gaap_GoodwillAcquiredDuringPeriod [1] $ 50,793,000us-gaap_GoodwillAcquiredDuringPeriod [2]  
Goodwill, Impaired, Accumulated Impairment Loss 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Amortization of Intangible Assets 12,501,000us-gaap_AmortizationOfIntangibleAssets 9,279,000us-gaap_AmortizationOfIntangibleAssets 6,089,000us-gaap_AmortizationOfIntangibleAssets
Electronics [Member] | Hamlin, Inc. [Member]      
Note 4 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Acquired During Period   24,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= lfus_ElectronicsMember		  
Electronics [Member]      
Note 4 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Acquired During Period 1,654,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= lfus_ElectronicsMember		 [1] 24,031,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= lfus_ElectronicsMember		 [2]  
Electrical [Member]      
Note 4 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Acquired During Period 14,920,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= lfus_ElectricalMember		 [1]    [2]  
Automotive [Member] | Hamlin, Inc. [Member]      
Note 4 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Acquired During Period   26,800,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= lfus_AutomotiveMember		  
Automotive [Member]      
Note 4 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Acquired During Period    [1] $ 26,762,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= lfus_AutomotiveMember		 [2]  
[1] Electronics addition of $1.7 million and Electrical addition of $14.9 million in 2014 resulted from business acquisitions.
[2] Electronic addition of $24.0 million and Automotive additions of $26.8 million in 2013 resulted from the acquisition of Hamlin.