v3.26.3

Basis of Presentation (Details)	9 Months Ended
Basis of Presentation (Details)	Sep. 27, 2026
Basis of Presentation
Length of fiscal year	365 days
Length of fiscal quarter	91 days

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the length of fiscal quarter of the entity.

No definition available.

Name:	wts_LengthOfFiscalQuarter
Namespace Prefix:	wts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the length of fiscal year of the entity.

No definition available.

Name:	wts_LengthOfFiscalYear
Namespace Prefix:	wts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration