2.2.0.7 false Income Taxes (Policies) 20600 - Disclosure - Income Taxes (Policies) true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 EPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Income Taxes (Policies) [Abstract] 0 wat_IncomeTaxesPoliciesAbstract wat false na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Uncertain Income Tax Reporting Positions Policy 1 wat_UncertainIncomeTaxReportingPositionsPolicyTextBlock wat false na duration Describes an entity's accounting policy for tax positions taken in the Company's tax return filed or to be filed for which it... false false false false false false false false false false false terselabel false 1 false false false false 0 0 The Company accounts for its uncertain tax return reporting positions in accordance with the accounting standards for income taxes, which require financial statement reporting of the expected future tax consequences of uncertain tax reporting positions on the presumption that all concerned tax authorities possess full knowledge of the reporting positions, as well as all of the pertinent facts and circumstances, but prohibit any discounting of unrecognized tax benefits associated with uncertain reporting positions for the time value of money. The Company accounts for its uncertain tax return reporting positions in accordance with the accounting standards for income taxes, which require financial false false false us-types:textBlockItemType textblock Describes an entity's accounting policy for tax positions taken in the Company's tax return filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of contingencies related to income taxes. No authoritative reference available. false 1 2 false UnKnown UnKnown UnKnown false true