| | | | | | | | | | | | | | | | | | | | | |
<?xml version="1.0" encoding="windows-1252"?> |
<FilingSummary> |
| <Version> 3.8.0.1 </Version> |
| <ProcessingTime/> |
| <ReportFormat> html </ReportFormat> |
| <ContextCount> 91 </ContextCount> |
| <ElementCount> 188 </ElementCount> |
| <EntityCount> 1 </EntityCount> |
| <FootnotesReported> false </FootnotesReported> |
| <SegmentCount> 39 </SegmentCount> |
| <ScenarioCount> 0 </ScenarioCount> |
| <TuplesReported> false </TuplesReported> |
| <UnitCount> 4 </UnitCount> |
| <MyReports> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R1.htm </HtmlFileName> |
| | | <LongName> 0001000 - Document - Document And Entity Information </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/DocumentAndEntityInformation </Role> |
| | | <ShortName> Document And Entity Information </ShortName> |
| | | <MenuCategory> Cover </MenuCategory> |
| | | <Position> 1 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R2.htm </HtmlFileName> |
| | | <LongName> 1001000 - Statement - Consolidated Balance Sheets </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedBalanceSheets </Role> |
| | | <ShortName> Consolidated Balance Sheets </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 2 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R3.htm </HtmlFileName> |
| | | <LongName> 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedBalanceSheetsParenthetical </Role> |
| | | <ShortName> Consolidated Balance Sheets (Parenthetical) </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 3 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R4.htm </HtmlFileName> |
| | | <LongName> 1002000 - Statement - Consolidated Statements Of Operations </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedStatementsOfOperations </Role> |
| | | <ShortName> Consolidated Statements Of Operations </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 4 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R5.htm </HtmlFileName> |
| | | <LongName> 1002501 - Statement - Consolidated Statements Of Operations (Parenthetical) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedStatementsOfOperationsParenthetical </Role> |
| | | <ShortName> Consolidated Statements Of Operations (Parenthetical) </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 5 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R6.htm </HtmlFileName> |
| | | <LongName> 1003000 - Statement - Consolidated Statements Of Comprehensive Income </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedStatementsOfComprehensiveIncome </Role> |
| | | <ShortName> Consolidated Statements Of Comprehensive Income </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 6 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R7.htm </HtmlFileName> |
| | | <LongName> 1003501 - Statement - Consolidated Statements Of Comprehensive Income (Parenthetical) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical </Role> |
| | | <ShortName> Consolidated Statements Of Comprehensive Income (Parenthetical) </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 7 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R8.htm </HtmlFileName> |
| | | <LongName> 1004000 - Statement - Consolidated Statements Of Cash Flows </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ConsolidatedStatementsOfCashFlows </Role> |
| | | <ShortName> Consolidated Statements Of Cash Flows </ShortName> |
| | | <MenuCategory> Statements </MenuCategory> |
| | | <Position> 8 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R9.htm </HtmlFileName> |
| | | <LongName> 2105100 - Disclosure - Interim Statement Presentation (Notes) </LongName> |
| | | <ReportType> Notes </ReportType> |
| | | <Role> http://www.cerner.com/role/InterimStatementPresentationNotes </Role> |
| | | <ShortName> Interim Statement Presentation (Notes) </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 9 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R10.htm </HtmlFileName> |
| | | <LongName> 2111100 - Disclosure - Fair Value Measurements </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/FairValueMeasurements </Role> |
| | | <ShortName> Fair Value Measurements </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 10 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R11.htm </HtmlFileName> |
| | | <LongName> 2113100 - Disclosure - Investments </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/Investments </Role> |
| | | <ShortName> Investments </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 11 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R12.htm </HtmlFileName> |
| | | <LongName> 2114100 - Disclosure - Receivables </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/Receivables </Role> |
| | | <ShortName> Receivables </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 12 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R13.htm </HtmlFileName> |
| | | <LongName> 2115100 - Disclosure - Income Taxes </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/IncomeTaxes </Role> |
| | | <ShortName> Income Taxes </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 13 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R14.htm </HtmlFileName> |
| | | <LongName> 2121100 - Disclosure - Earnings Per Share </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/EarningsPerShare </Role> |
| | | <ShortName> Earnings Per Share </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 14 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R15.htm </HtmlFileName> |
| | | <LongName> 2122100 - Disclosure - Share-Based Compensation </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensation </Role> |
| | | <ShortName> Share-Based Compensation </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 15 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R16.htm </HtmlFileName> |
| | | <LongName> 2123100 - Disclosure - Contingencies </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/Contingencies </Role> |
| | | <ShortName> Contingencies </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 16 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R17.htm </HtmlFileName> |
| | | <LongName> 2124100 - Disclosure - Segment Reporting </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/SegmentReporting </Role> |
| | | <ShortName> Segment Reporting </ShortName> |
| | | <MenuCategory> Notes </MenuCategory> |
| | | <Position> 17 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R18.htm </HtmlFileName> |
| | | <LongName> 2311301 - Disclosure - Fair Value Measurements (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/FairValueMeasurementsTables </Role> |
| | | <ShortName> Fair Value Measurements (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/FairValueMeasurements </ParentRole> |
| | | <Position> 18 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R19.htm </HtmlFileName> |
| | | <LongName> 2313301 - Disclosure - Investments Investments (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/InvestmentsInvestmentsTables </Role> |
| | | <ShortName> Investments Investments (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <Position> 19 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R20.htm </HtmlFileName> |
| | | <LongName> 2314301 - Disclosure - Receivables (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ReceivablesTables </Role> |
| | | <ShortName> Receivables (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/Receivables </ParentRole> |
| | | <Position> 20 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R21.htm </HtmlFileName> |
| | | <LongName> 2321301 - Disclosure - Earnings Per Share (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/EarningsPerShareTables </Role> |
| | | <ShortName> Earnings Per Share (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/EarningsPerShare </ParentRole> |
| | | <Position> 21 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R22.htm </HtmlFileName> |
| | | <LongName> 2322301 - Disclosure - Share-Based Compensation (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensationTables </Role> |
| | | <ShortName> Share-Based Compensation (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ShareBasedCompensation </ParentRole> |
| | | <Position> 22 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R23.htm </HtmlFileName> |
| | | <LongName> 2324301 - Disclosure - Segment Reporting (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/SegmentReportingTables </Role> |
| | | <ShortName> Segment Reporting (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/SegmentReporting </ParentRole> |
| | | <Position> 23 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R24.htm </HtmlFileName> |
| | | <LongName> 2405401 - Disclosure - Interim Statement Presentation Policies (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/InterimStatementPresentationPoliciesDetails </Role> |
| | | <ShortName> Interim Statement Presentation Policies (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 24 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R25.htm </HtmlFileName> |
| | | <LongName> 2411402 - Disclosure - Fair Value Measurements (Narrative) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/FairValueMeasurementsNarrativeDetails </Role> |
| | | <ShortName> Fair Value Measurements (Narrative) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/FairValueMeasurementsTables </ParentRole> |
| | | <Position> 25 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R26.htm </HtmlFileName> |
| | | <LongName> 2411403 - Disclosure - Fair Value Measurements Fair Value, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/FairValueMeasurementsFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails </Role> |
| | | <ShortName> Fair Value Measurements Fair Value, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <Position> 26 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R27.htm </HtmlFileName> |
| | | <LongName> 2413402 - Disclosure - Investments (Narrative) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/InvestmentsNarrativeDetails </Role> |
| | | <ShortName> Investments (Narrative) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/InvestmentsInvestmentsTables </ParentRole> |
| | | <Position> 27 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R28.htm </HtmlFileName> |
| | | <LongName> 2413403 - Disclosure - Investments (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/InvestmentsDetails </Role> |
| | | <ShortName> Investments (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/InvestmentsInvestmentsTables </ParentRole> |
| | | <Position> 28 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R29.htm </HtmlFileName> |
| | | <LongName> 2414402 - Disclosure - Receivables (Narrative) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ReceivablesNarrativeDetails </Role> |
| | | <ShortName> Receivables (Narrative) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ReceivablesTables </ParentRole> |
| | | <Position> 29 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R30.htm </HtmlFileName> |
| | | <LongName> 2414403 - Disclosure - Receivables (Summary Of Net Receivables) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ReceivablesSummaryOfNetReceivablesDetails </Role> |
| | | <ShortName> Receivables (Summary Of Net Receivables) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ReceivablesTables </ParentRole> |
| | | <Position> 30 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R31.htm </HtmlFileName> |
| | | <LongName> 2415401 - Disclosure - Income Taxes (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/IncomeTaxesDetails </Role> |
| | | <ShortName> Income Taxes (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/IncomeTaxes </ParentRole> |
| | | <Position> 31 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R32.htm </HtmlFileName> |
| | | <LongName> 2421402 - Disclosure - Earnings Per Share (Reconciliation Of The Numerators And The Denominators Of The Basic And Diluted Per Share) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/EarningsPerShareReconciliationOfNumeratorsAndDenominatorsOfBasicAndDilutedPerShareDetails </Role> |
| | | <ShortName> Earnings Per Share (Reconciliation Of The Numerators And The Denominators Of The Basic And Diluted Per Share) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/EarningsPerShareTables </ParentRole> |
| | | <Position> 32 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R33.htm </HtmlFileName> |
| | | <LongName> 2421403 - Disclosure - Earnings Per Share (Narrative) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/EarningsPerShareNarrativeDetails </Role> |
| | | <ShortName> Earnings Per Share (Narrative) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/EarningsPerShareTables </ParentRole> |
| | | <Position> 33 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R34.htm </HtmlFileName> |
| | | <LongName> 2422402 - Disclosure - Share-Based Compensation (Schedule Of Stock Options Activity) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensationScheduleOfStockOptionsActivityDetails </Role> |
| | | <ShortName> Share-Based Compensation (Schedule Of Stock Options Activity) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ShareBasedCompensationTables </ParentRole> |
| | | <Position> 34 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R35.htm </HtmlFileName> |
| | | <LongName> 2422403 - Disclosure - Share-Based Compensation (Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensationScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsDetails </Role> |
| | | <ShortName> Share-Based Compensation (Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ShareBasedCompensationTables </ParentRole> |
| | | <Position> 35 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R36.htm </HtmlFileName> |
| | | <LongName> 2422404 - Disclosure - Share-Based Compensation (Schedule Of Non-Vested Shares Activity) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensationScheduleOfNonVestedSharesActivityDetails </Role> |
| | | <ShortName> Share-Based Compensation (Schedule Of Non-Vested Shares Activity) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ShareBasedCompensationTables </ParentRole> |
| | | <Position> 36 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R37.htm </HtmlFileName> |
| | | <LongName> 2422405 - Disclosure - Share-Based Compensation (Compensation Expense Recognized In The Condensed Consolidated Statements Of Operations) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensationCompensationExpenseRecognizedInCondensedConsolidatedStatementsOfOperationsDetails </Role> |
| | | <ShortName> Share-Based Compensation (Compensation Expense Recognized In The Condensed Consolidated Statements Of Operations) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ShareBasedCompensationTables </ParentRole> |
| | | <Position> 37 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R38.htm </HtmlFileName> |
| | | <LongName> 2422406 - Disclosure - Share-Based Compensation (Narrative) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/ShareBasedCompensationNarrativeDetails </Role> |
| | | <ShortName> Share-Based Compensation (Narrative) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/ShareBasedCompensationTables </ParentRole> |
| | | <Position> 38 </Position> |
| | | </Report> |
| | <Report instance="cern-20170930.xml"> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <HtmlFileName> R39.htm </HtmlFileName> |
| | | <LongName> 2424402 - Disclosure - Segment Reporting (Summary Of The Operating Information) (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cerner.com/role/SegmentReportingSummaryOfOperatingInformationDetails </Role> |
| | | <ShortName> Segment Reporting (Summary Of The Operating Information) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cerner.com/role/SegmentReportingTables </ParentRole> |
| | | <Position> 39 </Position> |
| | | </Report> |
| | <Report> |
| | | <IsDefault> false </IsDefault> |
| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <LongName> All Reports </LongName> |
| | | <ReportType> Book </ReportType> |
| | | <ShortName> All Reports </ShortName> |
| | | </Report> |
| | </MyReports> |
| <InputFiles> |
| | <File> cern-20170930.xml </File> |
| | <File> cern-20170930.xsd </File> |
| | <File> cern-20170930_cal.xml </File> |
| | <File> cern-20170930_def.xml </File> |
| | <File> cern-20170930_lab.xml </File> |
| | <File> cern-20170930_pre.xml </File> |
| | </InputFiles> |
| <SupplementalFiles/> |
| <BaseTaxonomies> |
| | <BaseTaxonomy> http://xbrl.sec.gov/dei/2014-01-31 </BaseTaxonomy> |
| | <BaseTaxonomy> http://fasb.org/us-gaap/2017-01-31 </BaseTaxonomy> |
| | </BaseTaxonomies> |
| <HasPresentationLinkbase> true </HasPresentationLinkbase> |
| <HasCalculationLinkbase> true </HasCalculationLinkbase> |
| </FilingSummary> |