Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-13646
Entity Registrant Name	LCI INDUSTRIES
Entity Central Index Key	0000763744
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	DE
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
Trading Symbol	LCII
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,027,515