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Share-Based Compensation (Compensation Expense Recognized In The Condensed Consolidated Statements Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amounts charged against earnings, before income tax benefit $ 62,965us-gaap_AllocatedShareBasedCompensationExpense $ 48,954us-gaap_AllocatedShareBasedCompensationExpense $ 38,112us-gaap_AllocatedShareBasedCompensationExpense
Amount of related income tax benefit recognized in earnings 22,101us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 18,607us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 14,578us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock option and non-vested share compensation expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amounts charged against earnings, before income tax benefit 59,292us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_StockOptionAndNonVestedShareCompensationExpenseMember
46,295us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_StockOptionAndNonVestedShareCompensationExpenseMember
36,113us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_StockOptionAndNonVestedShareCompensationExpenseMember
Associate stock purchase plan expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amounts charged against earnings, before income tax benefit 4,603us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_AssociateStockPurchasePlanExpenseMember
3,704us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_AssociateStockPurchasePlanExpenseMember
2,859us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_AssociateStockPurchasePlanExpenseMember
Amounts capitalized in software development costs, net of amortization      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amounts charged against earnings, before income tax benefit $ (930)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_AmountsCapitalizedInSoftwareDevelopmentCostsMember
$ (1,045)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_AmountsCapitalizedInSoftwareDevelopmentCostsMember
$ (860)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= cern_AmountsCapitalizedInSoftwareDevelopmentCostsMember