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Note 2 - Acquisition of Business (Details) (USD $)
0 Months Ended 3 Months Ended
Jan. 03, 2014
Mar. 29, 2014
Jan. 03, 2014
Note 2 - Acquisition of Business (Details) [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired (in Dollars)   $ 52,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Minimum [Member] | SymCom, Inc. [Member] | Trademarks [Member]      
Note 2 - Acquisition of Business (Details) [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years    
Minimum [Member] | SymCom, Inc. [Member] | Patents [Member]      
Note 2 - Acquisition of Business (Details) [Line Items]      
Finite-Lived Intangible Asset, Useful Life 16 years    
Maximum [Member] | SymCom, Inc. [Member] | Trademarks [Member]      
Note 2 - Acquisition of Business (Details) [Line Items]      
Finite-Lived Intangible Asset, Useful Life 20 years    
Maximum [Member] | SymCom, Inc. [Member] | Patents [Member]      
Note 2 - Acquisition of Business (Details) [Line Items]      
Finite-Lived Intangible Asset, Useful Life 17 years    
SymCom, Inc. [Member]      
Note 2 - Acquisition of Business (Details) [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
  100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
Payments to Acquire Businesses, Net of Cash Acquired (in Dollars) 52,800,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
   
Business Acquisition, Inventory Step-up (in Dollars) 2,600,000lfus_BusinessAcquisitionInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
  2,600,000lfus_BusinessAcquisitionInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember
Non-cash Charges Related to Inventory Step-up (in Dollars)   $ 1,400,000lfus_NoncashChargesRelatedToInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember