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v3.21.1

Basis of Presentation (Details) | Mar. 31, 2021
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Manufacturing Facility |
Property, Plant and Equipment |
Manufacturing Facilities | 100

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- Definition Number of manufacturing facilities + References No definition available. + Details
Name: | lcii_NumberOfManufacturingFacilities
Namespace Prefix: | lcii_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ManufacturingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |