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EQUITY COMMON SHARE REPURCHASE PROGRAM (Details) | Sep. 30, 2017 shares
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COMMON SHARE REPURCHASE PROGRAM [Abstract] |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 55,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 8,628,875

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- Definition COMMON SHARE REPURCHASE PROGRAM [Abstract] + References No definition available. + Details
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Namespace Prefix: | leco_
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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Period Type: | instant

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant