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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended								8 Months Ended	12 Months Ended			44 Months Ended
	May 31, 2017	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Percent of net sales derived from operations outside United States											71.00%	69.00%	68.00%
Foreign currency transaction gain (loss)											$ (1,000,000)	$ (4,000,000)	$ 3,000,000
Percent of net sales to pharmaceutical industry											56.00%	56.00%	54.00%
Proceeds from sale of assets												$ 4,000,000	$ 5,154,000
Long-term investments		$ 7,000,000								$ 7,000,000	$ 7,000,000			$ 7,000,000
Advertising expense											6,000,000	$ 11,000,000	11,000,000
Acquired in-process research and development					$ 5,000,000						5,000,000		$ 3,855,000
Potential payments under licensing arrangements		7,000,000								7,000,000	$ 7,000,000			7,000,000
Maximum percentage of net sales to an individual customer											2.00%	2.00%	2.00%
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. treasury bill money market funds and commercial paper.
Cash, cash equivalents and investments		3,394,000,000				$ 2,813,000,000				3,394,000,000	$ 3,394,000,000	$ 2,813,000,000		3,394,000,000
Allowance for Doubtful Accounts and Sales Returns Roll Forward [Abstract]
Allowances for doubtful accounts and sales returns, balance at beginning of period					8,657,000				$ 7,496,000		8,657,000	7,496,000	$ 7,179,000
Additions to allowance for doubtful accounts and sales returns											9,059,000	6,912,000	6,739,000
Deductions from allowance for doubtful accounts and sales returns											(8,386,000)	(5,751,000)	(6,422,000)
Allowances for doubtful accounts and sales returns, balance at end of period		9,330,000				8,657,000				9,330,000	$ 9,330,000	8,657,000	7,496,000	9,330,000
Allowance for doubtful accounts description											Past due balances over 90 days and over a specified amount are reviewed individually for collectibility.
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		349,278,000				337,118,000				349,278,000	$ 349,278,000	$ 337,118,000	333,355,000	349,278,000
Intangible Assets [Line Items]
Number of reporting units for goodwill impairment testing											2
Finite-lived intangible assets, average useful life in years											7 years	7 years
Capitalized software development costs for software sold to customers, net		153,000,000				132,000,000				153,000,000	$ 153,000,000	$ 132,000,000		153,000,000
Additions to capitalized software development costs for software sold to customers											$ 35,000,000	33,000,000
Derivative Instrument Detail [Abstract]
Foreign currency exposure											The Company is a global company that operates in over 35 countries and, as a result, the Company’s net sales, cost of sales, operating expenses and balance sheet amounts are significantly impacted by fluctuations in foreign currency exchange rates.
Maturity period of foreign exchange contracts											The Company periodically aggregates its net worldwide balances by currency and then enters into foreign currency exchange contracts that mature within 90 days to hedge a portion of the remaining balance to minimize some of the Company’s currency price risk exposure.
Notional amount of foreign exchange contracts		147,000,000				120,000,000				147,000,000	$ 147,000,000	120,000,000	116,000,000	147,000,000
Realized gains (losses) on closed contracts											3,894,000	(10,401,000)	(2,601,000)
Unrealized gains (losses) on open contracts											1,054,000	(883,000)	742,000
Cumulative net pre-tax gains (losses)											4,948,000	(11,284,000)	(1,859,000)
Stock Repurchase Program [Line Items]
Treasury stock											332,544,000	325,759,000	334,705,000
Debt [Line Items]
Long-term debt		1,897,501,000				1,701,966,000				1,897,501,000	1,897,501,000	1,701,966,000		1,897,501,000
Warranty Accrual Roll Forward [Abstract]
Accrued warranty liability, balance at beginning of period					$ 13,391,000				$ 13,349,000		13,391,000	13,349,000	13,266,000
Accruals for warranties											8,746,000	9,755,000	8,390,000
Settlements made											(9,111,000)	(9,713,000)	(8,307,000)
Accrued warranty liability, balance at end of period		$ 13,026,000				$ 13,391,000				13,026,000	$ 13,026,000	$ 13,391,000	$ 13,349,000	13,026,000
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income per diluted common share		$ (4.44)	$ 1.69	$ 1.63	$ 1.31	$ 2.15	$ 1.53	$ 1.57	$ 1.15		$ 0.25	$ 6.41	$ 5.65
Excess tax benefit related to stock option plans												$ 13,844,000	$ 12,955,000
Fair Value Measurements, Recurring
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		$ 2,945,758,000				$ 2,432,195,000				2,945,758,000	$ 2,945,758,000	2,432,195,000		2,945,758,000
Waters 401(k) Restoration Plan assets		35,645,000				30,954,000				35,645,000	35,645,000	30,954,000		35,645,000
Forward foreign exchange contract assets		566,000				60,000				566,000	566,000	60,000		566,000
Fair value of total assets measured on a recurring basis		2,981,969,000				2,463,209,000				2,981,969,000	2,981,969,000	2,463,209,000		2,981,969,000
Contingent consideration		3,247,000				3,007,000				3,247,000	3,247,000	3,007,000		3,247,000
Forward foreign exchange contract liabilities		182,000				730,000				182,000	182,000	730,000		182,000
Fair value of total liabilities measured on a recurring basis		3,429,000				3,737,000				3,429,000	3,429,000	3,737,000		3,429,000
Fair Value Measurements, Recurring | Quoted Prices in Active Market for Identical Assets (Level 1)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Waters 401(k) Restoration Plan assets		35,645,000				30,954,000				35,645,000	35,645,000	30,954,000		35,645,000
Fair value of total assets measured on a recurring basis		35,645,000				30,954,000				35,645,000	35,645,000	30,954,000		35,645,000
Fair Value Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Forward foreign exchange contract assets		566,000				60,000				566,000	566,000	60,000		566,000
Fair value of total assets measured on a recurring basis		2,946,324,000				2,432,255,000				2,946,324,000	2,946,324,000	2,432,255,000		2,946,324,000
Forward foreign exchange contract liabilities		182,000				730,000				182,000	182,000	730,000		182,000
Fair value of total liabilities measured on a recurring basis		182,000				730,000				182,000	182,000	730,000		182,000
Fair Value Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		3,247,000				3,007,000				3,247,000	3,247,000	3,007,000		3,247,000
Fair value of total liabilities measured on a recurring basis		3,247,000				3,007,000				3,247,000	3,247,000	3,007,000		3,247,000
Held in currencies other than U.S. dollars [Member]
Cash Equivalents and Investments [Line Items]
Cash, cash equivalents and investments		304,000,000				261,000,000				$ 304,000,000	$ 304,000,000	$ 261,000,000		304,000,000
Programs authorized by Board of Directors [Member]
Stock Repurchase Program [Line Items]
Treasury stock shares acquired											1.8	2.3	2.6
Treasury stock											$ 323,000,000	$ 318,000,000	$ 327,000,000
Related to Vesting of Restricted Stock Units [Member]
Stock Repurchase Program [Line Items]
Treasury stock											10,000,000	8,000,000	7,000,000
May 2017 Program [Member]
Stock Repurchase Program [Line Items]
Stock repurchase program authorization amount	$ 1,000,000,000
Treasury stock shares acquired										1.1
Treasury stock										$ 200,000,000
Stock repurchase program remaining amount authorized for future purchases		800,000,000								800,000,000	$ 800,000,000			$ 800,000,000
Stock repurchase program period	3 years
May 2014 Program [Member]
Stock Repurchase Program [Line Items]
Treasury stock shares acquired														5.5
Treasury stock														$ 750,000,000
Buildings [Member] | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											15 years
Buildings [Member] | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											30 years
Building Improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											5 years
Building Improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											10 years
Production and other equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											3 years
Production and other equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											10 years
Internal-Use Software [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment											10 years
Property, plant and equipment, net		3,000,000				3,000,000				3,000,000	$ 3,000,000	3,000,000		3,000,000
US Treasury Securities | Fair Value Measurements, Recurring
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		591,988,000				570,313,000				591,988,000	591,988,000	570,313,000		591,988,000
US Treasury Securities | Fair Value Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		591,988,000				570,313,000				591,988,000	591,988,000	570,313,000		591,988,000
Foreign Government Debt Securities | Fair Value Measurements, Recurring
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		6,952,000				17,991,000				6,952,000	6,952,000	17,991,000		6,952,000
Foreign Government Debt Securities | Fair Value Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		6,952,000				17,991,000				6,952,000	6,952,000	17,991,000		6,952,000
Corporate Debt Securities | Fair Value Measurements, Recurring
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		1,975,160,000				1,643,838,000				1,975,160,000	1,975,160,000	1,643,838,000		1,975,160,000
Corporate Debt Securities | Fair Value Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		1,975,160,000				1,643,838,000				1,975,160,000	1,975,160,000	1,643,838,000		1,975,160,000
Time Deposits | Fair Value Measurements, Recurring
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		371,511,000				199,906,000				371,511,000	371,511,000	199,906,000		371,511,000
Time Deposits | Fair Value Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		371,511,000				199,906,000				371,511,000	371,511,000	199,906,000		371,511,000
Equity Securities | Fair Value Measurements, Recurring
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		147,000				147,000				147,000	147,000	147,000		147,000
Equity Securities | Fair Value Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]
Marketable securities		147,000				147,000				147,000	$ 147,000	147,000		147,000
Purchased intangibles [Member] | Minimum
Intangible Assets [Line Items]
Finite-lived intangible assets, average useful life in years											1 year
Purchased intangibles [Member] | Maximum
Intangible Assets [Line Items]
Finite-lived intangible assets, average useful life in years											15 years
Capitalized software [Member] | Minimum
Intangible Assets [Line Items]
Finite-lived intangible assets, average useful life in years											3 years
Capitalized software [Member] | Maximum
Intangible Assets [Line Items]
Finite-lived intangible assets, average useful life in years											10 years
Patents and other intangibles [Member] | Minimum
Intangible Assets [Line Items]
Finite-lived intangible assets, average useful life in years											1 year
Patents and other intangibles [Member] | Maximum
Intangible Assets [Line Items]
Finite-lived intangible assets, average useful life in years											10 years
Unsecured debt
Debt [Line Items]
Long-term debt		700,000,000				700,000,000				700,000,000	$ 700,000,000	700,000,000		700,000,000
Unsecured debt | Fixed interest rate [Member]
Debt [Line Items]
Long-term debt		610,000,000				610,000,000				610,000,000	610,000,000	610,000,000		610,000,000
Fair value of debt instrument		608,000,000				603,000,000				608,000,000	608,000,000	603,000,000		608,000,000
Held by foreign subsidiaries [Member]
Cash Equivalents and Investments [Line Items]
Cash, cash equivalents and investments		$ 3,326,000,000				$ 2,766,000,000				$ 3,326,000,000	3,326,000,000	2,766,000,000		$ 3,326,000,000
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Quantification of adoption of new accounting pronouncement or change in accounting principle											$ 20,000,000
Net income per diluted common share											$ 0.24
Excess tax benefit related to stock option plans												$ 13,844,000	$ 12,955,000

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