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Hedging Activities (Fair Value Of Net Investment Hedge Within Condensed Consolidated Balance Sheets And Unrealized Gain Or Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Jan. 03, 2015
Derivatives, Fair Value [Line Items]      
Fair Value $ 13,853us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue   $ 14,233us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue
Net Unrealized Gain (Loss) 220us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax (182)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax  
Short-term liabilities      
Derivatives, Fair Value [Line Items]      
Net Unrealized Gain (Loss) 220us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax
/ us-gaap_BalanceSheetLocationAxis
= cern_ShortTermLiabilitiesMember		 (91)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax
/ us-gaap_BalanceSheetLocationAxis
= cern_ShortTermLiabilitiesMember		  
Long-term liabilities      
Derivatives, Fair Value [Line Items]      
Net Unrealized Gain (Loss) $ 0us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax
/ us-gaap_BalanceSheetLocationAxis
= cern_LongTermLiabilitiesMember		 $ (91)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax
/ us-gaap_BalanceSheetLocationAxis
= cern_LongTermLiabilitiesMember