v3.26.1
Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Detail) - EBP 002 [Member] - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value $ 1,367,948,830 $ 1,240,408,037
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 1,367,948,830 1,240,408,037
Fair Value, Inputs, Level 1 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 221,766,445 234,145,449
Fair Value, Inputs, Level 2 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 1,146,182,385 1,006,262,588
Fair Value, Inputs, Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Waters Corporation Common Stock | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 66,671,560 68,447,665
Waters Corporation Common Stock | Fair Value, Inputs, Level 1 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 66,671,560 68,447,665
Waters Corporation Common Stock | Fair Value, Inputs, Level 2 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Waters Corporation Common Stock | Fair Value, Inputs, Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Interest-bearing cash | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 1,902,288 2,037,077
Interest-bearing cash | Fair Value, Inputs, Level 1 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 1,902,288 2,037,077
Interest-bearing cash | Fair Value, Inputs, Level 2 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Interest-bearing cash | Fair Value, Inputs, Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Mutual funds | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 91,975,288 108,329,133
Mutual funds | Fair Value, Inputs, Level 1 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 91,975,288 108,329,133
Mutual funds | Fair Value, Inputs, Level 2 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Mutual funds | Fair Value, Inputs, Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Self-directed brokerage assets | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 61,217,309 55,331,574
Self-directed brokerage assets | Fair Value, Inputs, Level 1 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 61,217,309 55,331,574
Self-directed brokerage assets | Fair Value, Inputs, Level 2 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Self-directed brokerage assets | Fair Value, Inputs, Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Common collective trusts | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 1,146,182,385 1,006,262,588
Common collective trusts | Fair Value, Inputs, Level 1 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 0 0
Common collective trusts | Fair Value, Inputs, Level 2 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value 1,146,182,385 1,006,262,588
Common collective trusts | Fair Value, Inputs, Level 3 [Member]    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value $ 0 $ 0