Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Total net sales	$ 799,887	$ 740,305	$ 2,232,924	$ 2,085,673
Waters instrument systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	281,909	265,273	747,099	691,760
Chemistry consumables [Member]
Disaggregation of Revenue [Line Items]
Total net sales	158,480	138,935	461,102	414,227
TA instrument systems [Member]
Disaggregation of Revenue [Line Items]
Total net sales	59,575	57,803	165,693	167,319
Product [Member]
Disaggregation of Revenue [Line Items]
Total net sales	499,964	462,011	1,373,894	1,273,306
Waters Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	272,986	251,444	781,308	734,125
TA Service [Member]
Disaggregation of Revenue [Line Items]
Total net sales	26,937	26,850	77,722	78,242
Total service sales [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 299,923	$ 278,294	$ 859,030	$ 812,367