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Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Disaggregation of Revenue [Line Items]        
Total net sales $ 659,233 $ 593,784 $ 1,949,425 $ 1,578,707
Waters Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 240,475 225,790 717,910 550,018
Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 123,045 108,175 368,478 300,525
TA Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 55,613 42,274 155,722 114,799
Product [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 419,133 376,239 1,242,110 965,342
Waters Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 218,291 199,501 644,625 562,843
TA Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 21,809 18,044 62,690 50,522
Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales $ 240,100 $ 217,545 $ 707,315 $ 613,365