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Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Disaggregation of Revenue [Line Items]        
Total net sales $ 681,647 $ 519,984 $ 1,290,192 $ 984,923
Waters Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 261,363 181,399 477,435 324,228
Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 126,459 95,105 245,433 192,350
TA Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 53,133 38,416 100,109 72,525
Product [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 440,955 314,920 822,977 589,103
Waters Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 219,502 189,205 426,334 363,342
TA Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 21,190 15,859 40,881 32,478
Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales $ 240,692 $ 205,064 $ 467,215 $ 395,820