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BASIS OF PRESENTATION (Details) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2015 VEB	Dec. 31, 2014 USD ($)	Mar. 31, 2014 VEB
Venezuela-Highly Inflationary Economy
Venezuela foreign currency transaction loss		$ 17,665us-gaap_ForeignCurrencyTransactionLossBeforeTax
Effect of liquidation of inventory valued at historical exchange rate after currency devaluation	3,468leco_EffectOfLiquidationOfInventoryValuedAtHistoricalExchangeRateAfterCurrencyDevaluation
SICAD I Rate				12.0leco_SICADIRate		10.7leco_SICADIRate
Net bolivar-denominated monetary assets position			1,314leco_AssetForeignCurrencyDenominatedValue		(1,264)leco_AssetForeignCurrencyDenominatedValue
Cash and Cash Equivalents Located in Venezuela			$ 6,223leco_CashandCashEquivalentsLocatedinVenezuela		$ 2,124leco_CashandCashEquivalentsLocatedinVenezuela

X

- Definition

The foreign currency-denominated net asset value.

+ References

No definition available.

+ Details

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Namespace Prefix:	leco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of cash and cash equivalents on hand at the Company's Venezuelan operations at the respective financial statement date's official exchange rates.

+ References

No definition available.

+ Details

Name:	leco_CashandCashEquivalentsLocatedinVenezuela
Namespace Prefix:	leco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The effect of liquidation of inventory valued at the historical exchange rate on the entity's pretax earnings, after a devaluation of foreign currency.

+ References

No definition available.

+ Details

Name:	leco_EffectOfLiquidationOfInventoryValuedAtHistoricalExchangeRateAfterCurrencyDevaluation
Namespace Prefix:	leco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the auction-based bolivars to US dollars foreign currency exchange rate applicable to the settlement of certain transaction through CENOEX, including payments of dividends and royalties.

+ References

No definition available.

+ Details

Name:	leco_SICADIRate
Namespace Prefix:	leco_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894

+ Details

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