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Basis of Presentation and Significant Accounting Policies (Tables)
 6 Months Ended
Jul. 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 July 1, 2017 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
       for Identical Observable Unobservable
    Total at  Assets Inputs Inputs
    July 1, 2017 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 626,587 $ - $ 626,587 $ -
 Foreign government securities   6,969   -   6,969   -
 Corporate debt securities   1,795,051   -   1,795,051   -
 Time deposits   295,845   -   295,845   -
 Equity securities   147   -   147   -
 Waters 401(k) Restoration Plan assets   32,200   32,200   -   -
 Foreign currency exchange contracts   1,418   -   1,418   -
  Total $ 2,758,217 $ 32,200 $ 2,726,017 $ -
               
Liabilities:            
 Contingent consideration $ 3,014 $ - $ - $ 3,014
 Foreign currency exchange contracts   11   -   11   -
  Total $ 3,025 $ - $ 11 $ 3,014

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 Six Months Ended
  July 1, 2017 July 2, 2016 July 1, 2017 July 2, 2016
Realized gains (losses) on closed contracts $ 1,868 $ (5,637) $ 430 $ (7,531)
Unrealized gains (losses) on open contracts   2,209   (963)   2,077   (992)
Cumulative net pre-tax gains (losses) $ 4,077 $ (6,600) $ 2,507 $ (8,523)
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):

   July 1, 2017 December 31, 2016
Other current assets $1,418 $60
Other current liabilities $11 $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 six months ended July 1, 2017 and July 2, 2016 (in thousands):

  Balance at     Balance at
  Beginning Accruals for Settlements End of
  of Period Warranties Made Period
Accrued warranty liability:            
July 1, 2017 $ 13,391 $ 3,842 $ (4,369) $ 12,864
July 2, 2016 $ 13,349 $ 4,297 $ (4,719) $ 12,927