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EQUITY COMMON SHARE REPURCHASE PROGRAM (Details)	Sep. 30, 2017 shares
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

X

- Definition

COMMON SHARE REPURCHASE PROGRAM [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	leco_
Data Type:	xbrli:stringItemType
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Period Type:	duration

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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_
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Balance Type:	na
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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