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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 |  | $ 17.1 us-gaap_DefinedBenefitPlanEffectOfPlanAmendmentOnAccumulatedBenefitObligation |  |
Increase in net loss |  | 10.5 wts_OtherComprehensiveIncomeDefinedBenefitPlanNetIncomeLossForThePeriodNetOfTax |  |
Net loss, tax benefits |  | 6.6 wts_OtherComprehensiveIncomeDefinedBenefitPlanIncomeTaxEffectNetOfTax |  |
Distribution plans | 2 wts_ShareBasedCompensationByShareBasedPaymentAwardsNumberOfDefinedBenefitPlans |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost - administrative costs | 0.4 us-gaap_DefinedBenefitPlanServiceCost |  | 0.2 us-gaap_DefinedBenefitPlanServiceCost |
Interest costs on benefits obligation | 1.4 us-gaap_DefinedBenefitPlanInterestCost |  | 1.5 us-gaap_DefinedBenefitPlanInterestCost |
Expected return on assets | (1.2)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets |  | (1.5)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets |
Net actuarial loss amortization | 0.4 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses |  | 0.3 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses |
Net periodic benefit cost | 1.0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | 0.5 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |
Defined Benefit Plan, Contributions by Employer | 0.3 us-gaap_DefinedBenefitPlanContributionsByEmployer |  | 0.2 us-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 | 40.0 us-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 | $ 45.0 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520743 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520782 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Represents the income tax effect attributable to pension and other postretirement benefit plans, after tax. + References No definition available. + Details
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- Definition The increase (decrease) in accumulated comprehensive income during the period related to net income (loss) attributable to pension and other postretirement benefit plans, after tax. + References No definition available. + Details
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- Definition Represents the number of defined benefit plans existing. + References No definition available. + Details
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- Definition Represents the term for settlement of liabilities to plan participants following termination date under Supplemental Employees Retirement Plan (the SERP). + References No definition available. + Details
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