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DEBT (Details) (USD $)
1 Months Ended 3 Months Ended
Sep. 30, 2014
Mar. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Apr. 01, 2015
Debt            
Line of Credit Facility, Fair Value of Amount Outstanding   $ 167,985,000us-gaap_ShortTermBankLoansAndNotesPayable     $ 68,166,000us-gaap_ShortTermBankLoansAndNotesPayable  
Revolving credit agreement            
Debt            
Borrowing capacity under the line of credit   400,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
       
Line of Credit Facility, Initiation Date Sep. 12, 2014          
Covenant compliance description   As of March 31, 2015, the Company was in compliance with all of its covenants        
Line of Credit Facility, Fair Value of Amount Outstanding   130,000,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
       
Additional increase in borrowing capacity of the line of credit available at the entity's option   100,000,000leco_LineOfCreditFacilityAdditionalCapacityIncreaseOption
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
       
Debt Instrument, Term   5 years        
Senior Notes [Member]            
Debt            
Debt Instrument, Issuance Date       Apr. 01, 2015    
Debt Instrument, Face Amount           350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Proceeds from Issuance of Unsecured Debt     200,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
150,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Debt, Weighted Average Interest Rate           3.50%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
AverageMaturityofDebtInstruments       19 years    
Minimum [Member] | Senior Notes [Member]            
Debt            
Debt Instrument, Term       10 years    
Maximum | Senior Notes [Member]            
Debt            
Debt Instrument, Term       30 years    
Senior Notes Series A [Member]            
Debt            
Debt Instrument, Maturity Date       Aug. 20, 2025    
Debt Instrument, Interest Rate, Stated Percentage           3.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesAMember
Debt Instrument, Face Amount           100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesAMember
Senior Notes Series B [Member]            
Debt            
Debt Instrument, Maturity Date       Aug. 20, 2030    
Debt Instrument, Interest Rate, Stated Percentage           3.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesBMember
Debt Instrument, Face Amount           100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesBMember
Senior Notes Series C [Member]            
Debt            
Debt Instrument, Maturity Date       Apr. 01, 2035    
Debt Instrument, Interest Rate, Stated Percentage           3.61%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesCMember
Debt Instrument, Face Amount           50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesCMember
Senior Notes Series D [Member]            
Debt            
Debt Instrument, Maturity Date       Apr. 01, 2045    
Debt Instrument, Interest Rate, Stated Percentage           4.02%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesDMember
Debt Instrument, Face Amount           $ 100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= leco_SeniorNotesSeriesDMember