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Defined Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 29, 2015
item
Sep. 28, 2014
Mar. 30, 2014
May 15, 2014
Increase in pension liability   $ 17.1us-gaap_DefinedBenefitPlanEffectOfPlanAmendmentOnAccumulatedBenefitObligation    
Increase in net loss   10.5wts_OtherComprehensiveIncomeDefinedBenefitPlanNetIncomeLossForThePeriodNetOfTax    
Net loss, tax benefits   6.6wts_OtherComprehensiveIncomeDefinedBenefitPlanIncomeTaxEffectNetOfTax    
Distribution plans 2wts_ShareBasedCompensationByShareBasedPaymentAwardsNumberOfDefinedBenefitPlans      
Components of net periodic benefit cost        
Service cost - administrative costs 0.4us-gaap_DefinedBenefitPlanServiceCost   0.2us-gaap_DefinedBenefitPlanServiceCost  
Interest costs on benefits obligation 1.4us-gaap_DefinedBenefitPlanInterestCost   1.5us-gaap_DefinedBenefitPlanInterestCost  
Expected return on assets (1.2)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets   (1.5)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets  
Net actuarial loss amortization 0.4us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses   0.3us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses  
Net periodic benefit cost 1.0us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost   0.5us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost  
Defined Benefit Plan, Contributions by Employer 0.3us-gaap_DefinedBenefitPlanContributionsByEmployer   0.2us-gaap_DefinedBenefitPlanContributionsByEmployer  
Minimum        
Term for settlement of liabilities to plan participants under SERP       12 months
Components of net periodic benefit cost        
Expected employer contributions in remainder of fiscal year 40.0us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum        
Term for settlement of liabilities to plan participants under SERP       24 months
Components of net periodic benefit cost        
Expected employer contributions in remainder of fiscal year $ 45.0us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MaximumMember