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Financial Instruments and Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jun. 28, 2015 | Mar. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 29, 2015 | Dec. 31, 2012
Tekmar |  |  |  |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |  |  |  |
Contingent liability of the acquisition date fair value |  |  |  |  |  |  | $ 5.1 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember
Contingent consideration payment | 2.3 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember | 2.2 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember | 1.2 us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |  |  |  |
Increase in fair value of contingent liability based on a revised estimate of the fair value of the contingent consideration |  |  |  | 0.5 wts_BusinessAcquisitionIncreaseDecreaseOfContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember | 1.0 wts_BusinessAcquisitionIncreaseDecreaseOfContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = wts_TekmarControlSystemsMember |  |
Contingent consideration |  |  |  |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  | 2.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByAssetClassAxis = wts_ContingentConsiderationMember |
Total realized and unrealized (gains) losses included in Comprehensive income |  |  |  |  |  | (0.2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByAssetClassAxis = wts_ContingentConsiderationMember |
Balance at the ending of the period |  |  |  |  |  | $ 2.3 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByAssetClassAxis = wts_ContingentConsiderationMember |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Cash outflow representing an adjustment to the purchase price of a previous acquisition. + References No definition available. + Details
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- Definition The increase (decrease) in potential payments under the contingent consideration arrangement. + References No definition available. + Details
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