Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 18, 2022	Jun. 30, 2021
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, 2021
Document Fiscal Year Focus	2021
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		25,281,956
Entity Well-known Seasoned Issuer	Yes
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,406,686,589
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 2022 Annual Meeting of Stockholders to be held on May 19, 2022 are incorporated by reference into Part III of this Annual Report on Form 10-K.
ICFR Auditor Attestation Flag	true