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DEBT Fair Value of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Disclosure [Abstract] |  |
Fair value of long-term debt | $ 785,579 | $ 721,494
Debt and Capital Lease Obligations, Excluding Short-term Borrowings | $ 715,795 | $ 712,414

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- Definition Sum of the carrying values as of the balance sheet date of long-term debt, and capital lease obligations. + References No definition available. + Details
Name: | leco_DebtAndCapitalLeaseObligationsExcludingShortTermBorrowings
Namespace Prefix: | leco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant