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Stock-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 Restricted Stock Plan [Member] | Sep. 27, 2014 Restricted Stock Unit Plan [Member] | Dec. 31, 2013 Restricted Stock Unit Plan [Member] | Sep. 27, 2014 Cost of sales [Member] | Sep. 28, 2013 Cost of sales [Member] | Sep. 27, 2014 Cost of sales [Member] | Sep. 28, 2013 Cost of sales [Member] | Sep. 27, 2014 Selling and administrative expenses [Member] | Sep. 28, 2013 Selling and administrative expenses [Member] | Sep. 27, 2014 Selling and administrative expenses [Member] | Sep. 28, 2013 Selling and administrative expenses [Member] | Sep. 27, 2014 Research and development expenses [Member] | Sep. 28, 2013 Research and development expenses [Member] | Sep. 27, 2014 Research and development expenses [Member] | Sep. 28, 2013 Research and development expenses [Member]
Stock-Based Compensation Allocation of Recognized Period Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated stock-based compensation expense | $ 8,107,000 | $ 8,678,000 | $ 24,460,000 | $ 23,985,000 |  |  |  | $ 633,000 | $ 630,000 | $ 2,061,000 | $ 1,955,000 | $ 6,355,000 | $ 7,110,000 | $ 19,345,000 | $ 19,081,000 | $ 1,119,000 | $ 938,000 | $ 3,054,000 | $ 2,949,000
Stock-Based Compensation by Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares at beginning of period |  |  |  |  |  | 642 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted |  |  |  |  | 12 | 134 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vested |  |  |  |  |  | (192) |  |  |  |  |  |  |  |  |  |  |  |  |
Shares forfeited |  |  |  |  |  | (16) |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares at end of period |  |  |  |  |  | 568 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of shares granted |  |  |  |  | $ 99.22 | $ 112.59 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of shares vested |  |  |  |  |  | $ 66.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of shares forfeited |  |  |  |  |  | $ 85.82 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of shares unvested |  |  |  |  |  | $ 94.57 | $ 82.16 |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option Fair Value Assumptions and Methodology [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option fair value assumptions, risk free interest rate |  |  | 1.90% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option fair value assumptions, expected life in years |  |  | 4 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option fair value assumptions, expected volatility |  |  | 24.50% | 25.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option fair value assumptions, expected dividends |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of options granted |  |  | $ 22.38 | $ 26.22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options Outstanding Roll Forward [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at beginning of period |  |  | 3,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  | 32 | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  | (654) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options canceled |  |  | (21) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at end of period | 3,274 |  | 3,274 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price of options outstanding at beginning of period |  |  | $ 71.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price of options granted |  |  | $ 99.22 | $ 95.72 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price of options exercised |  |  | $ 60.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price of options canceled |  |  | $ 88.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price of options outstanding at end of period | $ 73.38 |  | $ 73.38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options outstanding at beginning of period, lower range limit |  |  | $ 33.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options outstanding at beginning of period, upper range limit |  |  | $ 103.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options exercised, lower range limit |  |  | $ 33.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options exercised, upper range limit |  |  | $ 87.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options canceled, lower range limit |  |  | $ 79.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options canceled, upper range limit |  |  | $ 98.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options outstanding at end of period, lower range limit | $ 37.84 |  | $ 37.84 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range of options outstanding at end of period, upper range limit | $ 103.47 |  | $ 103.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the floor of a range of the price of expired options and the price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncomplia nce with plan terms during the reporting period . + References No definition available. + Details
Name: | wat_ExercisePriceRangeOfOptionsCanceledLowerRangeLimit
Namespace Prefix: | wat_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition For presentations that combine terminations, the ceiling of a range of the price of expired options and the price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncomplia nce with plan terms during the reporting period . + References No definition available. + Details
Name: | wat_ExercisePriceRangeOfOptionsCanceledUpperRangeLimit
Namespace Prefix: | wat_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a range of exercise prices at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period. + References No definition available. + Details
Name: | wat_ExercisePriceRangeOfOptionsExercisedLowerRangeLimit
Namespace Prefix: | wat_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a range of exercise prices at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period. + References No definition available. + Details
Name: | wat_ExercisePriceRangeOfOptionsExercisedUpperRangeLimit
Namespace Prefix: | wat_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a range of exercise prices at which grantees can acquire the shares reserved for issuance under the stock option plan. + References No definition available. + Details
Name: | wat_ExercisePriceRangeOfOptionsOutstandingLowerRangeLimit
Namespace Prefix: | wat_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The ceiling of a range of exercise prices at which grantees can acquire the shares reserved for issuance under the stock option plan. + References No definition available. + Details
Name: | wat_ExercisePriceRangeOfOptionsOutstandingUpperRangeLimit
Namespace Prefix: | wat_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant