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Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	12 Months Ended			1 Months Ended	32 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2014	Dec. 31, 2014	Jul. 31, 2014
Allowance for Doubtful Accounts and Sales Returns Roll Forward [Abstract]
Allowances for doubtful accounts and sales returns, balance at beginning of period		$ 7,057,000wat_AllowancesForDoubtfulAccountsAndSalesReturns	$ 8,240,000wat_AllowancesForDoubtfulAccountsAndSalesReturns	$ 8,584,000wat_AllowancesForDoubtfulAccountsAndSalesReturns
Additions to allowance for doubtful accounts and sales returns		7,551,000wat_AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns	4,386,000wat_AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns	7,298,000wat_AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns
Deductions from allowance for doubtful accounts and sales returns		(7,429,000)wat_DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns	(5,569,000)wat_DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns	(7,642,000)wat_DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns
Allowances for doubtful accounts and sales returns, balance at end of period	7,179,000wat_AllowancesForDoubtfulAccountsAndSalesReturns	7,179,000wat_AllowancesForDoubtfulAccountsAndSalesReturns	7,057,000wat_AllowancesForDoubtfulAccountsAndSalesReturns	8,240,000wat_AllowancesForDoubtfulAccountsAndSalesReturns		7,179,000wat_AllowancesForDoubtfulAccountsAndSalesReturns
Allowance for doubtful accounts description		Past due balances over 90 days and over a specified amount are reviewed individually for collectibility.
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Consolidated entities		The Company consolidates entities in which it owns or controls fifty percent or more of the voting shares.
Percent of net sales derived from operations outside United States		70.00%wat_PercentOfNetSalesDerivedFromOperationsOutsideUnitedStates	71.00%wat_PercentOfNetSalesDerivedFromOperationsOutsideUnitedStates	71.00%wat_PercentOfNetSalesDerivedFromOperationsOutsideUnitedStates
Foreign currency transactions disclosures		Gains and losses from foreign currency transactions are included in net income in the consolidated statements of operations and were not material for the years presented.	Gains and losses from foreign currency transactions are included in net income in the consolidated statements of operations and were not material for the years presented.	Gains and losses from foreign currency transactions are included in net income in the consolidated statements of operations and were not material for the years presented.
Percent of net sales to pharmaceutical industry		53.00%wat_PercentOfNetSalesToPharmaceuticalIndustry	52.00%wat_PercentOfNetSalesToPharmaceuticalIndustry	53.00%wat_PercentOfNetSalesToPharmaceuticalIndustry
Cost method of investments disclosures		The Company accounts for its investments that represent less than twenty percent ownership, and for which the Company does not have significant influence, using the accounting standards for investments in debt and equity securities. Investments for which the Company does not have the ability to exercise significant influence, and for which there is not a readily determinable market value, are accounted for under the cost method of accounting. The Company periodically evaluates the carrying value of its investments accounted for under the cost method of accounting and carries them at the lower of cost or estimated net realizable value.
Equity method of investments disclosures		For investments in which the Company owns or controls between twenty and forty-nine percent of the voting shares, or over which it exerts significant influence over operating and financial policies, the equity method of accounting is used. The Company’s share of net income or losses of equity investments is included in the consolidated statements of operations and was not material in any period presented.	The Company’s share of net income or losses of equity investments is included in the consolidated statements of operations and was not material in any period presented.	The Company’s share of net income or losses of equity investments is included in the consolidated statements of operations and was not material in any period presented.
Long-term investments	2,000,000us-gaap_LongTermInvestments	2,000,000us-gaap_LongTermInvestments	3,000,000us-gaap_LongTermInvestments			2,000,000us-gaap_LongTermInvestments
Advertising expense		12,000,000us-gaap_AdvertisingExpense	11,000,000us-gaap_AdvertisingExpense	13,000,000us-gaap_AdvertisingExpense
Acquired in-process research and development (Note 2)	15,456,000us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff	15,456,000us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff
Potential payments under licensing arrangements	15,000,000wat_PotentialPaymentsUnderLicensingArrangements	15,000,000wat_PotentialPaymentsUnderLicensingArrangements				15,000,000wat_PotentialPaymentsUnderLicensingArrangements
Maximum percentage of net sales to an individual customer		2.00%wat_MaximumPercentageOfNetSalesToIndividualCustomer	2.00%wat_MaximumPercentageOfNetSalesToIndividualCustomer	2.00%wat_MaximumPercentageOfNetSalesToIndividualCustomer
Derivative [Line Items]
Notional amount of foreign exchange contracts	110,000,000wat_DerivativeNotionalAmount1	110,000,000wat_DerivativeNotionalAmount1	104,000,000wat_DerivativeNotionalAmount1	134,000,000wat_DerivativeNotionalAmount1		110,000,000wat_DerivativeNotionalAmount1
Realized gains (losses) on foreign exchange contracts		174,000wat_RealizedGainLossOnForeignCurrencyDerivativesRecordedInEarningsNet	8,666,000wat_RealizedGainLossOnForeignCurrencyDerivativesRecordedInEarningsNet	4,186,000wat_RealizedGainLossOnForeignCurrencyDerivativesRecordedInEarningsNet
Unrealized gains (losses) on foreign exchange contracts		(1,369,000)wat_UnrealizedGainLossOnForeignCurrencyDerivativesRecordedInEarningsNet	361,000wat_UnrealizedGainLossOnForeignCurrencyDerivativesRecordedInEarningsNet	1,716,000wat_UnrealizedGainLossOnForeignCurrencyDerivativesRecordedInEarningsNet
Cumulative net pre-tax gains (losses) on forward foreign exchange contracts		(1,195,000)us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet	9,027,000us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet	5,902,000us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet
Maturity period of foreign exchange contracts		The periods of these forward contracts typically range from one to three months and have varying notional amounts, which are intended to be consistent with changes in the underlying exposures.
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	1,700,262,000wat_CashEquivalentsAndInvestmentsFairValue	1,700,262,000wat_CashEquivalentsAndInvestmentsFairValue	1,399,840,000wat_CashEquivalentsAndInvestmentsFairValue			1,700,262,000wat_CashEquivalentsAndInvestmentsFairValue
Other cash equivalents	29,000,000us-gaap_OtherCashEquivalentsAtCarryingValue	29,000,000us-gaap_OtherCashEquivalentsAtCarryingValue	62,851,000us-gaap_OtherCashEquivalentsAtCarryingValue			29,000,000us-gaap_OtherCashEquivalentsAtCarryingValue
Waters 401(k) Restoration Plan assets	33,935,000wat_WatersRestorationPlanAssets	33,935,000wat_WatersRestorationPlanAssets	31,203,000wat_WatersRestorationPlanAssets			33,935,000wat_WatersRestorationPlanAssets
Forward foreign exchange contract assets	123,000us-gaap_DerivativeFairValueOfDerivativeAsset	123,000us-gaap_DerivativeFairValueOfDerivativeAsset	929,000us-gaap_DerivativeFairValueOfDerivativeAsset			123,000us-gaap_DerivativeFairValueOfDerivativeAsset
Fair value of total assets measured on a recurring basis	1,763,320,000us-gaap_AssetsFairValueDisclosure	1,763,320,000us-gaap_AssetsFairValueDisclosure	1,494,823,000us-gaap_AssetsFairValueDisclosure			1,763,320,000us-gaap_AssetsFairValueDisclosure
Contingent consideration	3,612,000us-gaap_BusinessCombinationContingentConsiderationLiability	3,612,000us-gaap_BusinessCombinationContingentConsiderationLiability				3,612,000us-gaap_BusinessCombinationContingentConsiderationLiability	3,336,000us-gaap_BusinessCombinationContingentConsiderationLiability
Forward foreign exchange contract liabilities	651,000us-gaap_DerivativeFairValueOfDerivativeLiability	651,000us-gaap_DerivativeFairValueOfDerivativeLiability	88,000us-gaap_DerivativeFairValueOfDerivativeLiability			651,000us-gaap_DerivativeFairValueOfDerivativeLiability
Fair value of total liabilities measured on a recurring basis	4,263,000us-gaap_LiabilitiesFairValueDisclosure	4,263,000us-gaap_LiabilitiesFairValueDisclosure	88,000us-gaap_LiabilitiesFairValueDisclosure			4,263,000us-gaap_LiabilitiesFairValueDisclosure
Cash Equivalents and Investments [Line Items]
Cash equivalents description		Cash equivalents represent highly liquid investments, with original maturities of 90 days or less, primarily in bank deposits, U.S. and U.K. treasury bill money market funds and commercial paper.
Cash, cash equivalents and investments	2,055,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments	2,055,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments	1,804,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments			2,055,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments
Debt [Line Items]
Long-term debt	1,240,000,000us-gaap_LongTermDebtNoncurrent	1,240,000,000us-gaap_LongTermDebtNoncurrent	1,190,000,000us-gaap_LongTermDebtNoncurrent			1,240,000,000us-gaap_LongTermDebtNoncurrent
Intangible Assets [Line Items]
Number of reporting units for goodwill impairment testing		2us-gaap_NumberOfReportingUnits
Intangible assets, average useful life in years		8 years	8 years
Capitalized software development costs for software sold to customers, net	138,000,000us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers	138,000,000us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers	151,000,000us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers			138,000,000us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers
Additions to capitalized software development costs for software sold to customers		33,000,000us-gaap_CapitalizedComputerSoftwareAdditions	35,000,000us-gaap_CapitalizedComputerSoftwareAdditions
Property, Plant and Equipment [Line Items]
Property, plant and equipment disposition disclosures			Gains on disposal were $1 million during the year ended December 31, 2014 and were immaterial for both 2013 and 2012.	Gains on disposal were $1 million during the year ended December 31, 2014 and were immaterial for both 2013 and 2012.
Property, plant and equipment, net	321,583,000us-gaap_PropertyPlantAndEquipmentNet	321,583,000us-gaap_PropertyPlantAndEquipmentNet	324,932,000us-gaap_PropertyPlantAndEquipmentNet			321,583,000us-gaap_PropertyPlantAndEquipmentNet
Stock Repurchase Program [Line Items]
Treasury stock		337,444,000us-gaap_TreasuryStockValueAcquiredCostMethod	301,580,000us-gaap_TreasuryStockValueAcquiredCostMethod	295,878,000us-gaap_TreasuryStockValueAcquiredCostMethod
Warranty Accrual Roll Forward [Abstract]
Accrued warranty liability, balance at beginning of period		12,962,000us-gaap_StandardProductWarrantyAccrual	12,353,000us-gaap_StandardProductWarrantyAccrual	13,258,000us-gaap_StandardProductWarrantyAccrual
Accruals for warranties		8,148,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	8,466,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	7,212,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Settlements made		(7,844,000)us-gaap_StandardProductWarrantyAccrualPayments	(7,857,000)us-gaap_StandardProductWarrantyAccrualPayments	(8,117,000)us-gaap_StandardProductWarrantyAccrualPayments
Accrued warranty liability, balance at end of period	13,266,000us-gaap_StandardProductWarrantyAccrual	13,266,000us-gaap_StandardProductWarrantyAccrual	12,962,000us-gaap_StandardProductWarrantyAccrual	12,353,000us-gaap_StandardProductWarrantyAccrual		13,266,000us-gaap_StandardProductWarrantyAccrual
Programs authorized by Board of Directors [Member]
Stock Repurchase Program [Line Items]
Treasury stock shares acquired		3.1us-gaap_TreasuryStockSharesAcquired / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember	3.1us-gaap_TreasuryStockSharesAcquired / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember	3.5us-gaap_TreasuryStockSharesAcquired / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember
Treasury stock		329,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember	295,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember	290,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember
Stock repurchase program remaining amount authorized for future purchases	769,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember	769,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember				769,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / wat_StockRepurchaseProgramAxis = wat_ProgramsAuthorizedByBoardOfDirectorsMember
Related to Vesting of Restricted Stock Units [Member]
Stock Repurchase Program [Line Items]
Treasury stock		8,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_RelatedToVestingOfRestrictedStockUnitsMember	6,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_RelatedToVestingOfRestrictedStockUnitsMember	6,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_RelatedToVestingOfRestrictedStockUnitsMember
May 2014 Program [Member]
Stock Repurchase Program [Line Items]
Stock repurchase program authorization amount					750,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / wat_StockRepurchaseProgramAxis = wat_May2014ProgramMember
Stock repurchase program period					3 years
May 2012 Program [Member]
Stock Repurchase Program [Line Items]
Treasury stock shares acquired						7.4us-gaap_TreasuryStockSharesAcquired / wat_StockRepurchaseProgramAxis = wat_May2012ProgramMember
Treasury stock						731,000,000us-gaap_TreasuryStockValueAcquiredCostMethod / wat_StockRepurchaseProgramAxis = wat_May2012ProgramMember
Internal-Use Software [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		10 years
Property, plant and equipment, net	3,000,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	3,000,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	3,000,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember			3,000,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Minimum | Buildings [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		15 years
Minimum | Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		5 years
Minimum | Production and other equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		3 years
Maximum | Buildings [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		30 years
Maximum | Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		10 years
Maximum | Production and other equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment		10 years
Purchased intangibles [Member]
Intangible Assets [Line Items]
Intangible assets, average useful life in years		11 years	10 years
Purchased intangibles [Member] | Minimum
Intangible Assets [Line Items]
Intangible assets, average useful life in years		1 year
Purchased intangibles [Member] | Maximum
Intangible Assets [Line Items]
Intangible assets, average useful life in years		15 years
Capitalized software [Member]
Intangible Assets [Line Items]
Intangible assets, average useful life in years		7 years	7 years
Capitalized software [Member] | Minimum
Intangible Assets [Line Items]
Intangible assets, average useful life in years		3 years
Capitalized software [Member] | Maximum
Intangible Assets [Line Items]
Intangible assets, average useful life in years		10 years
Patents and other intangibles [Member]
Intangible Assets [Line Items]
Intangible assets, average useful life in years		8 years	8 years
Patents and other intangibles [Member] | Minimum
Intangible Assets [Line Items]
Intangible assets, average useful life in years		1 year
Patents and other intangibles [Member] | Maximum
Intangible Assets [Line Items]
Intangible assets, average useful life in years		10 years
Unsecured debt [Member]
Debt [Line Items]
Long-term debt	600,000,000us-gaap_LongTermDebtNoncurrent / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember	600,000,000us-gaap_LongTermDebtNoncurrent / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember	400,000,000us-gaap_LongTermDebtNoncurrent / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember			600,000,000us-gaap_LongTermDebtNoncurrent / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember
Fair value of debt instrument	608,000,000us-gaap_DebtInstrumentFairValue / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember	608,000,000us-gaap_DebtInstrumentFairValue / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember	398,000,000us-gaap_DebtInstrumentFairValue / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember			608,000,000us-gaap_DebtInstrumentFairValue / wat_DebtTypeAxis = us-gaap_UnsecuredDebtMember
Held by foreign subsidiaries [Member]
Cash Equivalents and Investments [Line Items]
Cash, cash equivalents and investments	1,971,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments / wat_CashCashEquivalentsAndInvestmentsGeographyAxis = wat_HeldByForeignSubsidiariesMember	1,971,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments / wat_CashCashEquivalentsAndInvestmentsGeographyAxis = wat_HeldByForeignSubsidiariesMember	1,738,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments / wat_CashCashEquivalentsAndInvestmentsGeographyAxis = wat_HeldByForeignSubsidiariesMember			1,971,000,000us-gaap_CashCashEquivalentsAndShortTermInvestments / wat_CashCashEquivalentsAndInvestmentsGeographyAxis = wat_HeldByForeignSubsidiariesMember
US Treasury Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	626,772,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_USTreasurySecuritiesMember	626,772,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_USTreasurySecuritiesMember	556,539,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_USTreasurySecuritiesMember			626,772,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_USTreasurySecuritiesMember
Foreign Government Debt Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	24,998,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember	24,998,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember	139,670,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember			24,998,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Corporate Debt Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	984,105,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_CorporateDebtSecuritiesMember	984,105,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_CorporateDebtSecuritiesMember	629,434,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_CorporateDebtSecuritiesMember			984,105,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Time Deposits
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	64,240,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_BankTimeDepositsMember	64,240,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_BankTimeDepositsMember	74,050,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_BankTimeDepositsMember			64,240,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_BankTimeDepositsMember
Equity Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	147,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_EquitySecuritiesMember	147,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_EquitySecuritiesMember	147,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_EquitySecuritiesMember			147,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_EquitySecuritiesMember
Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Other cash equivalents	29,000,000us-gaap_OtherCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	29,000,000us-gaap_OtherCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	62,851,000us-gaap_OtherCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			29,000,000us-gaap_OtherCashEquivalentsAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Waters 401(k) Restoration Plan assets	33,935,000wat_WatersRestorationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	33,935,000wat_WatersRestorationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	31,203,000wat_WatersRestorationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			33,935,000wat_WatersRestorationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Forward foreign exchange contract assets	123,000us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	123,000us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	929,000us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			123,000us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair value of total assets measured on a recurring basis	1,763,320,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	1,763,320,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	1,494,823,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			1,763,320,000us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Forward foreign exchange contract liabilities	651,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	651,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	88,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			651,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair value of total liabilities measured on a recurring basis	651,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	651,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	88,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			651,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) | US Treasury Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
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Significant Other Observable Inputs (Level 2) | Foreign Government Debt Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents and Investments, Fair Value	24,998,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	24,998,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	139,670,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member			24,998,000wat_CashEquivalentsAndInvestmentsFairValue / wat_CashCashEquivalentsAndInvestmentsTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
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Significant Other Observable Inputs (Level 2) | Time Deposits
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
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Significant Other Observable Inputs (Level 2) | Equity Securities
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
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Significant Unobservable Inputs (Level 3)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
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X

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Further narrative disclosure of claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables, etc.

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An element designated to encapsulate any additional information related to cash and cash equivalents not otherwise addressed by the existing taxonomy. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Additions made to capitalized computer software costs during the period.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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