v3.26.1
RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS (Details) - TopBuild Corp. 401(k) Plan - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS    
Investments, at fair value $ 674,592,317 $ 589,745,437
Fidelity    
RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS    
Fees paid 29,865  
TopBuild Stock Fund    
RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS    
Investments, at fair value 7,817,228 6,400,213
Common stock    
RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS    
Investments, at fair value 7,814,007 6,396,967
Cash and money market investments    
RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS    
Investments, at fair value $ 3,221 $ 3,246