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Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Disaggregation of Revenue [Line Items]    
Total net sales $ 661,705 $ 636,839
Waters Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 212,395 191,259
Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 137,637 134,207
TA Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 50,498 50,685
Product [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 400,530 376,151
Waters Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 237,265 236,433
TA Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 23,910 24,255
Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales $ 261,175 $ 260,688