- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of adjustment to the reserve attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ Details

Name:	wts_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationAdjustmentToReserve
Namespace Prefix:	wts
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of estimated reserve attributable to the disposal group, including a component of the entity (discontinued operation), as of the reporting period.

+ Details

Name:	wts_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationReserve
Namespace Prefix:	wts
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of disgorgement and prejudgment interest attributable to the disposal group, including a component of the entity (discontinued operation), as of the reporting period.

+ Details

Name:	wts_DisposalGroupIncludingDiscontinuedOperationDisgorgementAndPrejudgmentInterest
Namespace Prefix:	wts
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of penalties attributable to the disposal group, including a component of the entity (discontinued operation), as of the reporting period.

+ Details

Name:	wts_DisposalGroupIncludingDiscontinuedOperationPenalties
Namespace Prefix:	wts
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Contingencies and Environmental Remediation (Details) (CWV, USD $)	3 Months Ended	9 Months Ended
	Jul. 03, 2011	Oct. 02, 2011	Oct. 03, 2010	Apr. 04, 2010
CWV
Contingencies and Environmental Remediation
Estimated reserve				$ 5,300,000
Payment related to disgorgement and prejudgment interest		3,600,000
Penalties		200,000
Cost and Expenses (benefit)	$ 1,700,000		$ (5,600,000)