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Note 2 - Acquisition of Businesses (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Jan. 03, 2014
May 31, 2013
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Business Combination, Acquisition Related Costs $ 300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts               $ 500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 1,700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 900,000us-gaap_BusinessCombinationAcquisitionRelatedCosts    
Payments to Acquire Businesses, Net of Cash Acquired                 56,368,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 144,382,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 34,016,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired    
Finite-Lived Intangible Asset, Useful Life                 12 years 6 months 11 years 292 days      
Revenue, Net 206,620,000us-gaap_SalesRevenueNet [1] 217,608,000us-gaap_SalesRevenueNet [2] 220,908,000us-gaap_SalesRevenueNet [3] 206,859,000us-gaap_SalesRevenueNet [4] 198,129,000us-gaap_SalesRevenueNet [5] 201,040,000us-gaap_SalesRevenueNet [6] 187,766,000us-gaap_SalesRevenueNet [7] 170,918,000us-gaap_SalesRevenueNet [7],[8] 851,995,000us-gaap_SalesRevenueNet 757,853,000us-gaap_SalesRevenueNet 667,913,000us-gaap_SalesRevenueNet    
Net Income (Loss) Attributable to Parent 19,511,000us-gaap_NetIncomeLoss [1] 29,940,000us-gaap_NetIncomeLoss [2] 24,578,000us-gaap_NetIncomeLoss [3] 25,389,000us-gaap_NetIncomeLoss [4] 23,658,000us-gaap_NetIncomeLoss [5] 26,990,000us-gaap_NetIncomeLoss [6] 26,648,000us-gaap_NetIncomeLoss [7] 11,488,000us-gaap_NetIncomeLoss [7],[8] 99,418,000us-gaap_NetIncomeLoss 88,784,000us-gaap_NetIncomeLoss 75,332,000us-gaap_NetIncomeLoss    
Trademarks [Member] | SymCom, Inc. [Member] | Minimum [Member]                          
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Finite-Lived Intangible Asset, Useful Life                       15 years  
Trademarks [Member] | SymCom, Inc. [Member] | Maximum [Member]                          
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Finite-Lived Intangible Asset, Useful Life                       20 years  
Patents [Member] | SymCom, Inc. [Member] | Minimum [Member]                          
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Finite-Lived Intangible Asset, Useful Life                       16 years  
Patents [Member] | SymCom, Inc. [Member] | Maximum [Member]                          
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Finite-Lived Intangible Asset, Useful Life                       17 years  
Distribution Network, Trademarks and Patents [Member] | Hamlin, Inc. [Member]                          
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Finite-Lived Intangible Asset, Useful Life                         10 years
SymCom, Inc. [Member]                          
Note 2 - Acquisition of Businesses (Details) [Line Items]                          
Business Combination, Acquisition Related Costs     200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		                    
Business Acquisition, Percentage of Voting Interests Acquired                       100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		  
Payments to Acquire Businesses, Net of Cash Acquired                       52,800,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		  
Business Acquisition, Inventory Step-up     2,800,000lfus_BusinessAcquisitionInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_SymComIncMember		                 2,600,000lfus_BusinessAcquisitionInventoryStepup
/ 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		                  
Hamlin, Inc. [Member]                          
Note 2 - Acquisition of Businesses (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		            
Business Acquisition, Percentage of Voting Interests Acquired                         100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
Payments to Acquire Businesses, Net of Cash Acquired                         144,400,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember
Business Acquisition, Inventory Step-up         1,500,000lfus_BusinessAcquisitionInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		         1,500,000lfus_BusinessAcquisitionInventoryStepup
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		     2,100,000lfus_BusinessAcquisitionInventoryStepup
/ 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		            
Revenue, Net                   51,000,000us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		      
Net Income (Loss) Attributable to Parent                   $ 1,200,000us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= lfus_HamlinIncMember		      
[1] In the fourth quarter of 2014, the company recorded $2.2 million in charges related to severance and to the company's reorganization of its internal legal structure toenable the up-streaming of cash to the U.S. The company also recorded $0.3 million in acquisition costs and $0.3 million in impairment costs.
[2] In the third quarter of 2014, the company recorded $1.1 million in charges related to the company's reorganization of its internal legal structure, as noted above.
[3] In the second quarter of 2014, the company recorded a $1.4 million non-cash charge related to the step-up of inventory from the SymCom acquisition (See Note 2), $2.0 million in severance charges and $0.2 million in acquisition costs.
[4] In the first quarter of 2014, the company recorded a $1.4 million non-cash charge related to the step-up of inventory from the SymCom acquisition (See Note 2).
[5] In the fourth quarter of 2013, the company recorded a $2.8 million charge to income tax expense related to the company's impairment of its investment in Shocking Technologies in the fourth quarter of 2012 (See Note 6). The company also recorded a $0.5 million non-cash credit related to the step-up of inventory from the Hamlin acquisition (See Note 2) and $0.2 million in acquisition expenses for the Hamlin acquisition.
[6] In the third quarter of 2013, the company recorded a $0.3 million non-cash charge related to the step-up of inventory from the Hamlin acquisition (See Note 2). Thecompany also recorded $0.3 million in acquisition charges related to the Hamlin acquisition.
[7] In the second quarter of 2013, the company recorded a $1.7 million non-cash charge related to the step-up of inventory from the Hamlin acquisition (See Note 2).The company also recorded $1.2 million in acquisition charges related to the Hamlin acquisition.
[8] In the first quarter of 2013, the company recorded a $10.7 million charge related to the impairment of Shocking Technologies. Additionally, the company restated netincome for a $3.3 million charge to income tax expense related to the company's investment in Shocking Technologies (See Note 6).