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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 35 Months Ended
May. 31, 2014
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Apr. 04, 2015
Dec. 31, 2014
Derivative [Line Items]              
Notional amount of foreign currency exchange contracts   $ 112,000,000   $ 112,000,000     $ 110,000,000
Cumulative net pre-tax gains (losses) on foreign exchange contracts   2,262,000 $ 138,000 (743,000) $ (1,057,000)    
Realized gains (losses) on foreign exchange contracts   2,542,000 214,000 (805,000) (100,000)    
Unrealized (losses) gains on foreign exchange contracts   (280,000) (76,000) 62,000 (957,000)    
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   1,884,656,000   1,884,656,000     1,700,262,000
Other cash equivalents   28,999,000   28,999,000     29,000,000
Waters 401(k) Restoration Plan assets   35,908,000   35,908,000     33,935,000
Foreign currency exchange contract assets   149,000   149,000     123,000
Fair value of total assets measured on a recurring basis   1,949,712,000   1,949,712,000     1,763,320,000
Contingent consideration   3,948,000   3,948,000     3,612,000
Foreign currency exchange contract liabilities   614,000   614,000     651,000
Fair value of total liabilities measured on a recurring basis   4,562,000   4,562,000     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   $ 4,000,000     4,000,000
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   2,209,000,000   $ 2,209,000,000     2,055,000,000
Debt [Line Items]              
Long-term debt   1,385,000,000   1,385,000,000     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       3,744,000 3,230,000    
Settlements made       (3,971,000) (3,717,000)    
Accrued warranty liability, balance at end of period   13,039,000 $ 12,475,000 13,039,000 $ 12,475,000    
US Treasury Securities              
Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis [Line Items]              
Cash Equivalents and Investments, Fair Value   635,058,000   635,058,000     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   24,999,000   24,999,000     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   1,146,163,000   1,146,163,000     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   78,289,000   78,289,000     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       1.3 1.7    
Treasury stock       $ 165,000,000 $ 178,000,000    
Stock repurchase program remaining amount authorized for future purchases   604,000,000   604,000,000      
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   28,999,000   28,999,000     29,000,000
Waters 401(k) Restoration Plan assets   35,908,000   35,908,000     33,935,000
Foreign currency exchange contract assets   149,000   149,000     123,000
Fair value of total assets measured on a recurring basis   1,949,712,000   1,949,712,000     1,763,320,000
Foreign currency exchange contract liabilities   614,000   614,000     651,000
Fair value of total liabilities measured on a recurring basis   614,000   614,000     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   635,058,000   635,058,000     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   24,999,000   24,999,000     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   1,146,163,000   1,146,163,000     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   78,289,000   78,289,000     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   3,948,000   3,948,000     3,612,000
Fair value of total liabilities measured on a recurring basis   3,948,000   3,948,000     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   454,000,000   454,000,000     558,000,000
Held by foreign subsidiaries [Member]              
Cash Equivalents and Investments [Line Items]              
Cash, cash equivalents and investments   $ 2,162,000,000   $ 2,162,000,000     $ 1,971,000,000