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Financing Arrangements (Details 2) In Millions, unless otherwise specified |  |  | 0 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 3 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Feb. 18, 2014 Credit Agreement | Dec. 31, 2014 Credit Agreement USD ($) | Dec. 31, 2014 Credit Agreement EUR (€) | Feb. 18, 2014 Credit Agreement USD ($) | Feb. 18, 2014 Eurocurrency rate loans LIBOR Minimum | Feb. 18, 2014 Eurocurrency rate loans LIBOR Maximum | Feb. 18, 2014 Base rate loans and swing line loans LIBOR | Feb. 18, 2014 Base rate loans and swing line loans LIBOR Minimum | Feb. 18, 2014 Base rate loans and swing line loans LIBOR Maximum | Feb. 18, 2014 Base rate loans and swing line loans Federal funds | Feb. 18, 2014 Base rate loans and swing line loans Prime Rate | Jun. 30, 2013 Senior unsecured notes USD ($)
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multi-currency borrowing capacity |  |  |  |  |  | $ 500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Term of senior unsecured revolving credit facility |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Potential additional borrowing capacity |  |  |  |  |  | 500 wts_LineOfCreditFacilityOptionForAdditionalBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Sublimit on letters of credit |  |  |  |  |  | 100 wts_LettersOfCreditMaximumAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
Interest rate added to base rate (as a percent) |  |  |  |  |  |  | 0.975%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = wts_EurocurrencyRateLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = wts_EurocurrencyRateLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = wts_BaseRateAndSwingLineLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | 0.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = wts_BaseRateAndSwingLineLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Interest rate added to base rate (as a percent) |  |  |  |  |  |  |  |  | 1.00%wts_DebtInstrumentBasisSpreadOnVariableRateAdditional / us-gaap_DebtInstrumentAxis = wts_BaseRateAndSwingLineLoansMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  | 0.50%wts_DebtInstrumentBasisSpreadOnVariableRateAdditional / us-gaap_DebtInstrumentAxis = wts_BaseRateAndSwingLineLoansMember / us-gaap_VariableRateAxis = wts_DebtInstrumentVariableRateBaseFederalFundsMember |  |
Variable interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  | prime rate |
Unused and available credit under the credit agreement |  |  |  |  | 201.4 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |
Stand-by letters of credit outstanding | 23.6 us-gaap_LettersOfCreditOutstandingAmount | 23.6 us-gaap_LettersOfCreditOutstandingAmount |  | 23.6 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |
Debt outstanding | 577.8 us-gaap_LongTermDebtNoncurrent | 305.5 us-gaap_LongTermDebtNoncurrent |  |  | 275.0 us-gaap_LongTermDebtNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage points added to the specified reference rate to compute the variable rate on the debt instrument, in addition to the percentage points added regardless of specified reference rate. + References No definition available. + Details
Name: | wts_DebtInstrumentBasisSpreadOnVariableRateAdditional
Namespace Prefix: | wts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the maximum amount of the guarantees available through letters of credit. + References No definition available. + Details
Name: | wts_LettersOfCreditMaximumAmount
Namespace Prefix: | wts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the additional amount of borrowing capacity that may be added under the credit facility. + References No definition available. + Details
Name: | wts_LineOfCreditFacilityOptionForAdditionalBorrowingCapacity
Namespace Prefix: | wts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant