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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Stock Options Outstanding Roll Forward [Abstract]
Options outstanding at beginning of period			2,697
Options granted			207	86
Options exercised			(619)
Options canceled			(44)
Options outstanding at end of period	2,241		2,241
Weighted-average exercise price of options outstanding at beginning of period			$ 106.55
Weighted-average exercise price of options granted			149.74	$ 122.65
Weighted-average exercise price of options exercised			88.36
Weighted average exercise price of options canceled			114.38
Weighted-average exercise price of options outstanding at end of period	$ 115.41		$ 115.41
Stock-Based Compensation Allocation of Recognized Period Expense [Line Items]
Allocated stock-based compensation expense	$ 9,139,000	$ 8,396,000	$ 17,794,000	$ 24,237,000
Incremental stock-based compensation cost due to acceleration of awards				$ 7,000,000
Minimum
Stock Options Outstanding Roll Forward [Abstract]
Weighted-average exercise price of options outstanding at beginning of period			$ 38.09
Weighted-average exercise price of options granted			136.43
Weighted-average exercise price of options exercised			41.20
Weighted average exercise price of options canceled			87.06
Weighted-average exercise price of options outstanding at end of period	$ 38.09		38.09
Maximum
Stock Options Outstanding Roll Forward [Abstract]
Weighted-average exercise price of options outstanding at beginning of period			139.51
Weighted-average exercise price of options granted			154.33
Weighted-average exercise price of options exercised			134.37
Weighted average exercise price of options canceled			136.43
Weighted-average exercise price of options outstanding at end of period	$ 154.33		$ 154.33
Stock Options
Stock-Based Compensation Fair Value Assumptions and Methodology [Abstract]
Fair value assumptions, risk free interest rate			2.20%	1.50%
Fair value assumptions, expected life in years			6 years	5 years
Fair value assumptions, expected volatility			23.20%	28.60%
Fair value assumptions, expected dividends			$ 0	$ 0
Weighted-average grant date fair value of options granted			$ 40.39	$ 34.63
Restricted Stock Plan
Unvested Awards Roll Forward
Shares granted			7
Weighted-average grant date fair value of shares granted			$ 136.43
Restricted Stock Unit Plan
Stock-Based Compensation by Award [Line Items]
Award vesting period			5 years
Unvested Awards Roll Forward
Unvested shares at beginning of period			453
Shares granted			106
Shares vested			(131)
Shares forfeited			(15)
Unvested shares at end of period	413		413
Weighted-average grant date fair value of shares unvested at beginning of period			$ 110.34
Weighted-average grant date fair value of shares granted			154.23
Weighted-average grant date fair value of shares vested			105.18
Weighted-average grant date fair value of shares forfeited			115.34
Weighted-average grant date fair value of shares unvested at end of period	$ 123.06		$ 123.06
Performance Stock Unit Plan
Stock-Based Compensation Fair Value Assumptions and Methodology [Abstract]
Fair value assumptions, risk free interest rate			1.50%
Fair value assumptions, expected life in years			3 years
Fair value assumptions, expected volatility			23.20%
Fair value assumptions, expected volatility of peer companies			26.10%
Fair value assumptions, correlation coefficient			38.50%
Fair value assumptions, expected dividends			$ 0
Unvested Awards Roll Forward
Unvested shares at beginning of period			27
Shares granted			20
Unvested shares at end of period	47		47
Weighted-average grant date fair value of shares unvested at beginning of period			$ 171.16
Weighted-average grant date fair value of shares granted			198.78
Weighted-average grant date fair value of shares unvested at end of period	$ 184.40		$ 184.40
Performance Stock Unit Plan | Minimum
Stock-Based Compensation by Award [Line Items]
Award vesting rights			0.00%
Performance Stock Unit Plan | Maximum
Stock-Based Compensation by Award [Line Items]
Award vesting rights			200.00%
Cost of sales [Member]
Stock-Based Compensation Allocation of Recognized Period Expense [Line Items]
Allocated stock-based compensation expense	$ 787,000	656,000	$ 1,525,000	$ 1,327,000
Selling and administrative expenses [Member]
Stock-Based Compensation Allocation of Recognized Period Expense [Line Items]
Allocated stock-based compensation expense	7,602,000	6,613,000	14,790,000	20,582,000
Research and development expenses [Member]
Stock-Based Compensation Allocation of Recognized Period Expense [Line Items]
Allocated stock-based compensation expense	$ 750,000	$ 1,127,000	$ 1,479,000	$ 2,328,000

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Represents the correlation co-efficient used as a weighted-average assumption for share-based compensation.

+ References

No definition available.

+ Details

Name:	wat_CorrelationCoeffcient
Namespace Prefix:	wat_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	wat_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRateOfPeerCompanies
Namespace Prefix:	wat_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=wat_PerformanceStockUnitsPSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: