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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Defined Contribution Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Plan |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
Employer match of employee contributions of first 3% of eligible compensation (as a percent) | 100.00% |  |
Percentage of eligible compensation, matched 100% by employer (as a percent) | 3.00% |  |
Percentage of base pay as additional annual Company contribution to participants (as a percent) | 3.00% |  |
Annual costs recognized for defined contribution plans | $ 24,835 | $ 26,477 | $ 25,285
Minimum |  |  |
Defined Contribution Plan |  |  |
DefinedContributionPlanEmployeeServicePeriod | 5 years |  |
Maximum |  |  |
Defined Contribution Plan |  |  |
DefinedContributionPlanEmployeeServicePeriod | 30 years |  |

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- Definition Period of service for employee to receive additional defined contribution employer match. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployeeServicePeriod
Namespace Prefix: | leco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the employer additional matching contributions to a defined contribution plan for participants employer after certain date. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployersAdditionalAnnualMatch
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |