XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.8.0.1

BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Basis of Presentation [Line Items] |  |
Other components of net periodic pension income | $ 1,008 | $ 2,079
Operating Income (Loss) [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
Basis of Presentation [Line Items] |  |
Other components of net periodic pension income |  | 2,079
Cost of Sales [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
Basis of Presentation [Line Items] |  |
Other components of net periodic pension income |  | 1,193
Selling, General and Administrative Expenses [Member] | Adjustments for New Accounting Pronouncement [Member] |  |
Basis of Presentation [Line Items] |  |
Other components of net periodic pension income |  | $ 886

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

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingIncomeLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_NewAccountingPronouncementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |