XML 61 R46.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Description of Business (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018
Minimum |
Length of time the business has been in operation | 140 years

X
- Definition Represents the period of time the entity has been in business. + References No definition available. + Details
Name: | wts_PeriodOfBusinessOperations
Namespace Prefix: | wts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |