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Financial Instruments and Derivative Instruments (Details 3) | 3 Months Ended
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Mar. 29, 2015
Derivative instruments |
Percentage of projected intercompany purchases hedged by forward exchange contracts | 50.00%wts_PercentageOfProjectedIntercompanyPurchaseTransactionsHedgedForNextTwelveMonthsByForwardExchangeContracts
Period of projected intercompany purchase transactions | 12 months

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- Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions. + References No definition available. + Details
Name: | wts_MaximumLengthOfTimeHedgedInForeignCurrencyContract
Namespace Prefix: | wts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of projected intercompany purchase transactions hedged for the next twelve months by forward exchange contracts. + References No definition available. + Details
Name: | wts_PercentageOfProjectedIntercompanyPurchaseTransactionsHedgedForNextTwelveMonthsByForwardExchangeContracts
Namespace Prefix: | wts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration