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BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basis of Presentation [Line Items]
Other components of net periodic pension (cost) income	$ 1,199	$ 766

X

- Definition

[Line Items] for Basis of Presentation [Table]

+ References

No definition available.

+ Details

Name:	leco_BasisOfPresentationLineItems
Namespace Prefix:	leco_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of defined benefit plan cost (credit), classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanOtherCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration