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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
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Disaggregation of Revenue [Line Items]
Total net sales	$ 771,332	$ 708,529	$ 1,433,037	$ 1,345,368
Waters Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	252,795	235,228	465,190	426,487
Chemistry Consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	164,985	141,085	302,622	275,292
TA Instrument Systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	55,620	58,831	106,118	109,516
Product [Member]
Disaggregation of Revenue [Line Items]
Total net sales	473,400	435,144	873,930	811,295
Waters Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	271,057	246,248	508,322	482,681
TA Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	26,875	27,137	50,785	51,392
Total service sales [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 297,932	$ 273,385	$ 559,107	$ 534,073

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