| r0.c0 | HBO [member]/Current | ocw-dm:HBOMember | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r1.c0 | MBO [member]/Current | ocw-dm:MBOMember | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r2.c0 | VO [member]/Current | ocw-dm:VOMember | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r3.c0 | PO [member]/Current | ocw-dm:POMember | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r4.c0 | Other government funded activities [member]/Current | ocw-dm:OtherGovernmentFundedActivitiesMember | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r5.c0 | Segment reporting, total [member]/Current | ocw-dm:SegmentReportingTotalMember | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r6.c0 | Segment information, classes [title]/Current | ocw-abstr:SegmentReportingClassesTitle | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r7.c0 | Central government contributions/Current | ocw-i:GovernmentContributionsCentralGovernment | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r8.c0 | Government contributions and subsidies overige overheden/Current | ocw-i:GovernmentContributionsSubsidiesOtherGovernments | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r9.c0 | Tuition and exam fees/Current | ocw-i:IncomeTuitionAndExamFees | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r10.c0 | Income from third party contracts/Current | ocw-i:IncomeThirdPartyContracts | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r11.c0 | Other operating income/Current | jenv-bw2-i:OperatingIncomeOther | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r12.c0 | Operating income/Current | jenv-bw2-i:OperatingIncome | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r13.c0 | Income/Current | jenv-bw2-abstr:BW2IncomeTitle | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r14.c0 | Expenses of employee benefits/Current | jenv-bw2-i:EmployeeBenefitsExpenses | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r15.c0 | Amortisation of intangible assets and depreciation of property, plant and equipment/Current | jenv-bw2-i:DepreciationPropertyPlantEquipmentAmortisationIntangibleAssets | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r16.c0 | Accommodation costs/Current | rj-i:AccommodationCosts | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r17.c0 | Other operating expenses/Current | jenv-bw2-i:OperatingExpensesOther | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r18.c0 | Operating expenses/Current | jenv-bw2-i:OperatingExpenses | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r19.c0 | Expenses/Current | jenv-bw2-abstr:BW2ExpensesTitle | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r20.c0 | Operating result/Current | jenv-bw2-i:OperatingResult | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r21.c0 | Revaluation reserve realised/Current | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r22.c0 | Financial income/Current | rj-i:FinancialIncome | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r23.c0 | Financial expenses/Current | rj-i:FinancialExpenses | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r24.c0 | Result before tax/Current | jenv-bw2-i:ResultBeforeTax | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r25.c0 | Income tax expense/Current | jenv-bw2-i:IncomeTaxExpense | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r26.c0 | Result from participating interests/Current | jenv-bw2-i:ShareInResultsParticipatingInterests | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r27.c0 | Result after tax/Current | jenv-bw2-i:ResultAfterTax | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r28.c0 | Result attributable to non-controlling interest/Current | jenv-bw2-i:ResultAttributableNoncontrollingInterest | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r29.c0 | Sum of results/Current | ocw-i:SumOfResults | nl-types:monetaryNoDecimalsItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |
| r30.c0 | Segment reporting, income statement, line items [title]/Current | ocw-abstr:IncomeStatementSegmentReportingLineItemsTitle | xbrli:stringItemType | duration | jenv-bw2-dm:SeparateMember | ocw-dm:ActualsMember | xs:date('2018-01-01')/xs:date('2018-12-31') |