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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Entity Registrant Name LCI INDUSTRIES    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Incorporation, State or Country Code DE    
Entity Central Index Key 0000763744    
Trading Symbol LCII    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   25,327,542  
Entity Well-known Seasoned Issuer Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 2,298,408,339
Entity File Number 001-13646    
Entity Tax Identification Number 13-3250533    
Entity Address, Address Line One 3501 County Road 6 East    
Entity Address, City or Town Elkhart,    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 46514    
City Area Code 574    
Local Phone Number 535-1125    
Title of 12(b) Security Common Stock, $.01 par value    
Security Exchange Name NYSE    
Documents Incorporated by Reference
Portions of the Proxy Statement for the 2024 Annual Meeting of Stockholders to be held on May 16, 2024 are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false