v3.26.1
FAIR VALUE MEASUREMENTS (Details) - EBP 003 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value $ 1,161,341,933 $ 988,176,374
Interest and non-interest bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 1,032,890
Registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 388,407,577 332,036,474
Lithia Motors, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 32,214,409 36,976,215
Common collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 740,719,947 618,130,795
LEVEL 1, 2 AND 3 | Interest and non-interest bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 1,032,890
LEVEL 1, 2 AND 3 | Registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 388,407,577 332,036,474
LEVEL 1, 2 AND 3 | Lithia Motors, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 32,214,409 36,976,215
LEVEL 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 420,621,986 370,045,579
LEVEL 1 | Interest and non-interest bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 1,032,890
LEVEL 1 | Registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 388,407,577 332,036,474
LEVEL 1 | Lithia Motors, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 32,214,409 36,976,215
LEVEL 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 2 | Interest and non-interest bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 2 | Registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 2 | Lithia Motors, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 3 | Interest and non-interest bearing cash    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 3 | Registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
LEVEL 3 | Lithia Motors, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value 0 0
NAV | Common collective trust funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Plan's investment assets at fair value $ 740,719,947 $ 618,130,795