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Contingencies and Environmental Remediation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 29, 2015 item
Litigation contingencies |
Reasonably possible loss in excess of the amount accrued for its legal contingencies | 6.4 us-gaap_LossContingencyRangeOfPossibleLossMaximum
Asbestos Litigation |
Litigation contingencies |
Number of lawsuits the entity is defending in different jurisdictions | 250 us-gaap_LossContingencyNumberOfDefendants / us-gaap_LossContingenciesByNatureOfContingencyAxis = wts_AsbestosLitigationMember

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- Details
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- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfDefendants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Balance Type: | debit
Period Type: | instant

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Namespace Prefix: |
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Balance Type: |
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