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Fair Value Measurements (Schedule Of Non-Recurring Losses Recognized Using Fair Value Measurements And The Carrying Value Of Any Assets And Liabilities Measured Using Fair Value Estimates) (Details) - Fair Value, Measurements, Nonrecurring - Net assets of acquired businesses - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Assets |  |
Assets, carrying value | $ 117,933 | $ 35,224
Assets, non-recurring losses (gains) | $ 0 | $ 0

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- Definition Non-Recurring Gains (Losses) On Assets + References No definition available. + Details
Name: | lcii_NonRecurringGainsLossesOnAssets
Namespace Prefix: | lcii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAlternativeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=lcii_NetAssetsOfAcquiredBusinessesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |