XML 56 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Contingencies and Environmental Remediation (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Apr. 01, 2018 USD ($) item | Aug. 31, 2017 item
Litigation contingencies |  |
Possible loss | $ | $ 6.0 |
CWV |  |
Litigation contingencies |  |
Number of companies included in group for environmental liability notice |  | 162
Number of companies joining group for environmental liability notice | 43 |
Number of potentially responsible parties for environmental liability | 2,000 |

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + 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
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of companies joining group for environmental liability notice. + References No definition available. + Details
Name: | wts_NumberOfAdditionalCompaniesJoiningGroupForEnvironmentalLiabilityNotice
Namespace Prefix: | wts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of companies included in group for environmental liability notice. + References No definition available. + Details
Name: | wts_NumberOfCompaniesPartOfGroupForEnvironmentalLiabilityNotice
Namespace Prefix: | wts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of potentially responsible parties for environmental liability. + References No definition available. + Details
Name: | wts_NumberOfPotentiallyResponsibleParties
Namespace Prefix: | wts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=wts_WattsValveChangshaCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |