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Cover
Apr. 29, 2021
Apr. 12, 2021
Entity Information [Line Items]    
Document Type 8-K  
Document Period End Date Apr. 29, 2021  
Entity Registrant Name   LITHIA MOTORS INC
Entity Incorporation, State or Country Code OR  
Entity File Number 001-14733  
Entity Tax Identification Number 93-0572810  
Entity Address, Address Line One 150 N. Bartlett Street  
Entity Address, City or Town Medford  
Entity Address, State or Province OR  
Entity Address, Postal Zip Code 97501  
City Area Code   541
Local Phone Number   776-6401
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Class A common stock without par value  
Trading Symbol LAD  
Security Exchange Name NYSE  
Entity Emerging Growth Company false  
Entity Central Index Key   0001023128
Amendment Flag   false