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FAIR VALUE (Textual) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis
Fair value of long-term debt	$ 631,600	$ 687,428
Carrying value of long-term debt	$ 698,578	$ 704,247

X

- 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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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