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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
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total net sales	$ 740,305	$ 711,692	$ 2,085,673	$ 2,136,942
Waters Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	265,273	262,142	691,760	786,293
Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	138,935	128,650	414,227	398,084
TA Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	57,803	57,289	167,319	178,087
Product [Member]
Disaggregation of Revenue [Line Items]
Total net sales	462,011	448,081	1,273,306	1,362,464
Waters Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	251,444	238,556	734,125	700,281
TA Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	26,850	25,055	78,242	74,197
Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 278,294	$ 263,611	$ 812,367	$ 774,478

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