Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that are vested and validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	wts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberVested
Namespace Prefix:	wts_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options reserved for issuance under agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	wts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingNumber
Namespace Prefix:	wts_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average purchase price as of the beginning of the year pertaining to an equity-based payment instrument, excluding stock (or unit) options that are outstanding under the plan.

+ References

No definition available.

+ Details

Name:	wts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAveragePurchasePrice
Namespace Prefix:	wts_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average purchase price pertaining to an equity-based payment instrument, excluding stock (or unit) options, that are vested as of the end of the year.

+ References

No definition available.

+ Details

Name:	wts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAveragePurchasePriceVested
Namespace Prefix:	wts_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsExercisePriceRangeLineItems
Namespace Prefix:	wts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The floor of a customized range of purchase prices for purposes of disclosing shares potentially issuable under outstanding equity-based payment equity instruments, excluding stock (or unit) options on all plans and other required information pertaining to awards in the customized range.

+ References

No definition available.

+ Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsPurchasePriceRangeLowerRangeLimit
Namespace Prefix:	wts_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsPurchasePriceRangeOutstandingAwardsAbstract
Namespace Prefix:	wts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of purchase prices for purposes of disclosing shares potentially issuable under outstanding equity-based payment equity instruments, excluding stock (or unit) options and other required information pertaining to awards in the customized range.

+ References

No definition available.

+ Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsPurchasePriceRangeUpperRangeLimit
Namespace Prefix:	wts_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsPurchasePriceRangeVestedAwardsAbstract
Namespace Prefix:	wts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PlanNameAxis=wts_ManagementStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsByExercisePriceRangeAxis=wts_RangeOfPurchasePricesOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsByExercisePriceRangeAxis=wts_RangeOfPurchasePricesThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wts_ShareBasedCompensationSharesAuthorizedUnderEquityInstrumentsOtherThanOptionsByExercisePriceRangeAxis=wts_RangeOfPurchasePricesTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock-Based Compensation (Details 5) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
RSUs Vested
Common Stock, Dividends, Per Share, Cash Paid	$ 0.15	$ 0.15	$ 0.15	$ 0.13	$ 0.13	$ 0.13	$ 0.13	$ 0.11	$ 0.58	$ 0.50	$ 0.44
Class A
RSUs Vested
Common Stock, Dividends, Per Share, Cash Paid									$ 0.58	$ 0.50	$ 0.44
Class B
RSUs Vested
Common Stock, Dividends, Per Share, Cash Paid									$ 0.58	$ 0.50	$ 0.44
Management Stock Purchase Plan \| Restricted stock units (RSUs)
RSUs Outstanding
Number Outstanding (in shares)	80				132				80	132	196	392
Weighted Average Purchase Price (in dollars per share)	$ 32.08				$ 27.46				$ 32.08	$ 27.46	$ 22.88	$ 18.74
RSUs Vested
Number Vested (in shares)	31				42				31	42	81
Weighted Average Purchase Price (in dollars per share)	$ 27.96				$ 25.30				$ 27.96	$ 25.30	$ 20.36
$13.25-$19.87 \| Management Stock Purchase Plan \| Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									$ 13.25
High end of purchase price range (in dollars per share)									$ 19.87
RSUs Outstanding
Number Outstanding (in shares)	1								1
Weighted Average Purchase Price (in dollars per share)	$ 19.87								$ 19.87
RSUs Vested
Number Vested (in shares)	1								1
Weighted Average Purchase Price (in dollars per share)	$ 19.87								$ 19.87
$25.15-$26.51 \| Management Stock Purchase Plan \| Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									$ 25.15
High end of purchase price range (in dollars per share)									$ 26.51
RSUs Outstanding
Number Outstanding (in shares)	28								28
Weighted Average Purchase Price (in dollars per share)	$ 26.45								$ 26.45
RSUs Vested
Number Vested (in shares)	20								20
Weighted Average Purchase Price (in dollars per share)	$ 26.42								$ 26.42
$31.63-$31.63 \| Management Stock Purchase Plan \| Restricted stock units (RSUs)
Information about RSUs outstanding
Low end of purchase price range (in dollars per share)									$ 31.63
High end of purchase price range (in dollars per share)									$ 40.27
RSUs Outstanding
Number Outstanding (in shares)	51								51
Weighted Average Purchase Price (in dollars per share)	$ 35.45								$ 35.45
RSUs Vested
Number Vested (in shares)	10								10
Weighted Average Purchase Price (in dollars per share)	$ 31.63								$ 31.63