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Basis of Presentation and Significant Accounting Policies (Tables)
 3 Months Ended
Apr. 01, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets And Liabilities

The following table represents the Company's assets and liabilities that are measured at fair value on a recurring basis at April 1, 2017 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
       for Identical Observable Unobservable
    Total at  Assets Inputs Inputs
    April 1, 2017 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 522,012 $ - $ 522,012 $ -
 Foreign government securities   3,981   -   3,981   -
 Corporate debt securities   1,769,436   -   1,769,436   -
 Time deposits   305,462   -   305,462   -
 Equity securities   147   -   147   -
 Waters 401(k) Restoration Plan assets   32,894   32,894   -   -
 Foreign currency exchange contracts   183   -   183   -
  Total $ 2,634,115 $ 32,894 $ 2,601,221 $ -
               
Liabilities:            
 Contingent consideration $ 3,010 $ - $ - $ 3,010
 Foreign currency exchange contracts   985   -   985   -
  Total $ 3,995 $ - $ 985 $ 3,010

The following table represents the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2016 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
    Total at for Identical Observable Unobservable
    December 31,  Assets Inputs Inputs
    2016 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 570,313 $ - $ 570,313 $ -
 Foreign government securities   17,991   -   17,991   -
 Corporate debt securities   1,643,838   -   1,643,838   -
 Time deposits   199,906   -   199,906   -
 Equity securities   147   -   147   -
 Waters 401(k) Restoration Plan assets   30,954   30,954   -   -
 Foreign currency exchange contracts   60   -   60   -
  Total $ 2,463,209 $ 30,954 $ 2,432,255 $ -
               
Liabilities:            
 Contingent consideration $ 3,007 $ - $ - $ 3,007
 Foreign currency exchange contracts   730   -   730   -
  Total $ 3,737 $ - $ 730 $ 3,007
Summary of Derivative Instruments by Risk Exposure [Abstract]  
Gains (Losses) on Foreign Exchange Contracts

The following is a summary of the activity included in cost of sales in the statements of operations related to the foreign currency exchange contracts (in thousands):

  Three Months Ended
  April 1, 2017 April 2, 2016
Realized losses on closed contracts $ (1,438) $ (1,895)
Unrealized losses on open contracts   (132)   (28)
Cumulative net pre-tax losses $ (1,570) $ (1,923)
Fair Value of Forward Foreign Exchange Contracts

The Company's foreign currency exchange contracts included in the consolidated balance sheets are classified as follows (in thousands):

   April 1, 2017 December 31, 2016
Other current assets $183 $60
Other current liabilities $985 $730
Warranty Accrual Roll Forward [Abstract]  
Warranty Accrual Roll Forward

The following is a summary of the activity of the Company's accrued warranty liability for the three months ended April 1, 2017 and April 2, 2016 (in thousands):

  Balance at     Balance at
  Beginning Accruals for Settlements End of
  of Period Warranties Made Period
Accrued warranty liability:            
April 1, 2017 $ 13,391 $ 1,815 $ (2,208) $ 12,998
April 2, 2016 $ 13,349 $ 1,681 $ (2,198) $ 12,832