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Basis of Presentation (Details)	3 Months Ended
	Apr. 01, 2018
Basis of Presentation
Length of fiscal year	365 days
Length of fiscal quarter	91 days

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- References

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Definition

Represents the length of fiscal quarter of the entity.

+ References

No definition available.

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Namespace Prefix:	wts_
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Period Type:	duration

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- Definition

Represents the length of fiscal year of the entity.

+ References

No definition available.

+ Details

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