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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Apr. 04, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowances for doubtful accounts and sales returns $ 7,002wat_AllowancesForDoubtfulAccountsAndSalesReturns $ 7,179wat_AllowancesForDoubtfulAccountsAndSalesReturns
Preferred stock, par value per share $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value per share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 400,000,000us-gaap_CommonStockSharesAuthorized 400,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 157,030,000us-gaap_CommonStockSharesIssued 156,716,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 82,701,000us-gaap_CommonStockSharesOutstanding 83,147,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 74,329,000us-gaap_TreasuryStockShares 73,569,000us-gaap_TreasuryStockShares