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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 35 Months Ended
May. 31, 2014
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Apr. 04, 2015
Dec. 31, 2014
Derivative [Line Items]              
Notional amount of foreign currency exchange contracts   $ 107,000,000   $ 107,000,000     $ 110,000,000
Cumulative net pre-tax gains (losses) on foreign exchange contracts   739,000 $ (309,000) (4,000) $ (1,366,000)    
Realized gains (losses) on foreign exchange contracts   810,000 (266,000) 5,000 (366,000)    
Unrealized (losses) gains on foreign exchange contracts   (71,000) (43,000) (9,000) (1,000,000)    
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   1,943,898,000   1,943,898,000     1,700,262,000
Other cash equivalents   29,000,000   29,000,000     29,000,000
Waters 401(k) Restoration Plan assets   33,842,000   33,842,000     33,935,000
Foreign currency exchange contract assets   38,000   38,000     123,000
Fair value of total assets measured on a recurring basis   2,006,778,000   2,006,778,000     1,763,320,000
Contingent consideration   4,116,000   4,116,000     3,612,000
Foreign currency exchange contract liabilities   575,000   575,000     651,000
Fair value of total liabilities measured on a recurring basis   4,691,000   4,691,000     4,263,000
Property, Plant and Equipment [Line Items]              
Real estate impairment     4,000,000   4,000,000    
Fair value of building held-for-sale             4,000,000
Proceeds from sale of building       5,154,000      
Gain on sale of building       $ 1,377,000      
Cash Equivalents and Investments [Line Items]              
Cash equivalents description       Cash equivalents represent highly liquid investments, with original maturities of 90 days or less, while investments with longer maturities are classified as investments.      
Cash, cash equivalents and investments   2,311,000,000   $ 2,311,000,000     2,055,000,000
Debt [Line Items]              
Long-term debt   1,455,000,000   1,455,000,000     1,240,000,000
Warranty Accrual Roll Forward [Abstract]              
Accrued warranty liability, balance at beginning of period       13,266,000 12,962,000    
Accruals for warranties       5,834,000 5,292,000    
Settlements made       (5,993,000) (5,773,000)    
Accrued warranty liability, balance at end of period   13,107,000 $ 12,481,000 13,107,000 $ 12,481,000    
US Treasury Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   629,048,000   629,048,000     626,772,000
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             24,998,000
Corporate Debt Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   1,233,772,000   1,233,772,000     984,105,000
Time Deposits              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   80,931,000   80,931,000     64,240,000
Equity Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   147,000   $ 147,000     147,000
Programs authorized by Board of Directors [Member]              
Stock Repurchase Program [Line Items]              
Treasury stock shares acquired       2.0 2.4    
Treasury stock       $ 249,000,000 $ 255,000,000    
Stock repurchase program remaining amount authorized for future purchases   520,000,000   520,000,000      
Related To Vesting Of Restricted Stock Units [Member]              
Stock Repurchase Program [Line Items]              
Treasury stock       6,000,000 $ 7,000,000    
May 2014 Program [Member]              
Stock Repurchase Program [Line Items]              
Stock repurchase program authorization amount $ 750,000,000            
Stock repurchase program period, in years 3 years            
May 2012 Program [Member]              
Stock Repurchase Program [Line Items]              
Treasury stock shares acquired           7.6  
Treasury stock           $ 750,000,000  
Significant Other Observable Inputs (Level 2)              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Other cash equivalents   29,000,000   29,000,000     29,000,000
Waters 401(k) Restoration Plan assets   33,842,000   33,842,000     33,935,000
Foreign currency exchange contract assets   38,000   38,000     123,000
Fair value of total assets measured on a recurring basis   2,006,778,000   2,006,778,000     1,763,320,000
Foreign currency exchange contract liabilities   575,000   575,000     651,000
Fair value of total liabilities measured on a recurring basis   575,000   575,000     651,000
Significant Other Observable Inputs (Level 2) | US Treasury Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   629,048,000   629,048,000     626,772,000
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             24,998,000
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   1,233,772,000   1,233,772,000     984,105,000
Significant Other Observable Inputs (Level 2) | Time Deposits              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   80,931,000   80,931,000     64,240,000
Significant Other Observable Inputs (Level 2) | Equity Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   147,000   147,000     147,000
Significant Unobservable Inputs (Level 3)              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Contingent consideration   4,116,000   4,116,000     3,612,000
Fair value of total liabilities measured on a recurring basis   4,116,000   4,116,000     3,612,000
Unsecured debt              
Debt [Line Items]              
Long-term debt   500,000,000   500,000,000     600,000,000
Unsecured debt | Fixed interest rate [Member]              
Debt [Line Items]              
Long-term debt   450,000,000   450,000,000     550,000,000
Fair value of debt instruments   456,000,000   456,000,000     558,000,000
Held by foreign subsidiaries [Member]              
Cash Equivalents and Investments [Line Items]              
Cash, cash equivalents and investments   $ 2,275,000,000   $ 2,275,000,000     $ 1,971,000,000