Description of Plan - Additional information (Details) - EBP 002 [Member]	12 Months Ended
Dec. 31, 2025 USD ($)
EBP, Description of Plan [Line Items]
EBP, Automatic Participation Will Commence To Total Compensation Percentage	3.00%
EBP, Automatic Participation Annual Eligible Compensation To Total Compensation Percentage	1.00%
EBP, Automatic Participation Annual Eligible Compensation Reach To Total Compensation Percentage	6.00%
EBP, Employer contribution, participant compensation matched, percentage	100.00%
EBP, Employer Contribution, Matching Percentage	6.00%
EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount	$ 1,000
EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount	$ 50,000
Employee Benefit Plan Account Balance Minus Current Outstanding Loan Balance Percentage	50.00%
Maximum [Member]
EBP, Description of Plan [Line Items]
EBP, Voluntary Contribution To The Plan Through Deduction Percentage	60.00%
Employee Benefit Plan Outstanding Loan Percentage	8.50%
Minimum [Member]
EBP, Description of Plan [Line Items]
EBP, Voluntary Contribution To The Plan Through Deduction Percentage	1.00%
Employee Benefit Plan Outstanding Loan Percentage	3.25%

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

+ Details

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- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

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- Definition

Ebp automatic participation annual eligible compensation reach to total compensation percentage.

+ References

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- Definition

Ebp automatic participation annual eligible compensation to total compensation percentage.

+ References

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- Definition

EBP automatic participation will commence to total compensation percentage.

+ References

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- Definition

Ebp voluntary contribution to the plan through deduction percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	wat_
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- Definition

Employee benefit plan account balance minus current outstanding loan balance percentage.

+ References

No definition available.

+ Details

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- Definition

Employee benefit plan outstanding loan percentage.

+ References

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+ Details

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