| r0.c0 | Central government contributions/Current | ocw-i:GovernmentContributionsCentralGovernment | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r0.c1 | Central government contributions/Previous | ocw-i:GovernmentContributionsCentralGovernment | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r0.c2 | Central government contributions/Current | ocw-i:GovernmentContributionsCentralGovernment | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r1.c0 | Government contributions and subsidies overige overheden/Current | ocw-i:GovernmentContributionsSubsidiesOtherGovernments | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r1.c1 | Government contributions and subsidies overige overheden/Previous | ocw-i:GovernmentContributionsSubsidiesOtherGovernments | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r1.c2 | Government contributions and subsidies overige overheden/Current | ocw-i:GovernmentContributionsSubsidiesOtherGovernments | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r2.c0 | Tuition and exam fees/Current | ocw-i:IncomeTuitionAndExamFees | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r2.c1 | Tuition and exam fees/Previous | ocw-i:IncomeTuitionAndExamFees | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r2.c2 | Tuition and exam fees/Current | ocw-i:IncomeTuitionAndExamFees | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r3.c0 | Income from third party contracts/Current | ocw-i:IncomeThirdPartyContracts | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r3.c1 | Income from third party contracts/Previous | ocw-i:IncomeThirdPartyContracts | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r3.c2 | Income from third party contracts/Current | ocw-i:IncomeThirdPartyContracts | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r4.c0 | Other operating income/Current | venj-bw2-i:OperatingIncomeOther | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r4.c1 | Other operating income/Previous | venj-bw2-i:OperatingIncomeOther | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r4.c2 | Other operating income/Current | venj-bw2-i:OperatingIncomeOther | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r5.c0 | Operating income/Current | venj-bw2-i:OperatingIncome | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r5.c1 | Operating income/Previous | venj-bw2-i:OperatingIncome | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r5.c2 | Operating income/Current | venj-bw2-i:OperatingIncome | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r6.c0 | Income [title]/Current | venj-bw2-abstr:BW2IncomeTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r6.c1 | Income [title]/Previous | venj-bw2-abstr:BW2IncomeTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r6.c2 | Income [title]/Current | venj-bw2-abstr:BW2IncomeTitle | xbrli:stringItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r7.c0 | Expenses of employee benefits/Current | venj-bw2-i:EmployeeBenefitsExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r7.c1 | Expenses of employee benefits/Previous | venj-bw2-i:EmployeeBenefitsExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r7.c2 | Expenses of employee benefits/Current | venj-bw2-i:EmployeeBenefitsExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r8.c0 | Amortisation of intangible assets and depreciation of property, plant and equipment/Current | venj-bw2-i:DepreciationPropertyPlantEquipmentAmortisationIntangibleAssets | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r8.c1 | Amortisation of intangible assets and depreciation of property, plant and equipment/Previous | venj-bw2-i:DepreciationPropertyPlantEquipmentAmortisationIntangibleAssets | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r8.c2 | Amortisation of intangible assets and depreciation of property, plant and equipment/Current | venj-bw2-i:DepreciationPropertyPlantEquipmentAmortisationIntangibleAssets | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r9.c0 | Accommodation costs/Current | rj-i:AccommodationCosts | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r9.c1 | Accommodation costs/Previous | rj-i:AccommodationCosts | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r9.c2 | Accommodation costs/Current | rj-i:AccommodationCosts | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r10.c0 | Other operating expenses/Current | venj-bw2-i:OperatingExpensesOther | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r10.c1 | Other operating expenses/Previous | venj-bw2-i:OperatingExpensesOther | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r10.c2 | Other operating expenses/Current | venj-bw2-i:OperatingExpensesOther | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r11.c0 | Income transfers of government contributions to school boards/Current | ocw-i:GovernmentContributionsIncomeTransfersSchoolBoards | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r11.c1 | Income transfers of government contributions to school boards/Previous | ocw-i:GovernmentContributionsIncomeTransfersSchoolBoards | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r11.c2 | Income transfers of government contributions to school boards/Current | ocw-i:GovernmentContributionsIncomeTransfersSchoolBoards | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r12.c0 | Operating expenses/Current | venj-bw2-i:OperatingExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r12.c1 | Operating expenses/Previous | venj-bw2-i:OperatingExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r12.c2 | Operating expenses/Current | venj-bw2-i:OperatingExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r13.c0 | Expenses [title]/Current | venj-bw2-abstr:BW2ExpensesTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r13.c1 | Expenses [title]/Previous | venj-bw2-abstr:BW2ExpensesTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r13.c2 | Expenses [title]/Current | venj-bw2-abstr:BW2ExpensesTitle | xbrli:stringItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r14.c0 | Operating result/Current | venj-bw2-i:OperatingResult | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r14.c1 | Operating result/Previous | venj-bw2-i:OperatingResult | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r14.c2 | Operating result/Current | venj-bw2-i:OperatingResult | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r15.c0 | Revaluation reserve realised/Current | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r15.c1 | Revaluation reserve realised/Previous | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r15.c2 | Revaluation reserve realised/Current | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r16.c0 | Financial income/Current | rj-i:FinancialIncome | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r16.c1 | Financial income/Previous | rj-i:FinancialIncome | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r16.c2 | Financial income/Current | rj-i:FinancialIncome | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r17.c0 | Financial expenses/Current | rj-i:FinancialExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r17.c1 | Financial expenses/Previous | rj-i:FinancialExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r17.c2 | Financial expenses/Current | rj-i:FinancialExpenses | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r18.c0 | Result before tax/Current | venj-bw2-i:ResultBeforeTax | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r18.c1 | Result before tax/Previous | venj-bw2-i:ResultBeforeTax | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r18.c2 | Result before tax/Current | venj-bw2-i:ResultBeforeTax | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r19.c0 | Income tax expense/Current | venj-bw2-i:IncomeTaxExpense | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r19.c1 | Income tax expense/Previous | venj-bw2-i:IncomeTaxExpense | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r19.c2 | Income tax expense/Current | venj-bw2-i:IncomeTaxExpense | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r20.c0 | Share in results of participating interests/Current | venj-bw2-i:ShareInResultsParticipatingInterests | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r20.c1 | Share in results of participating interests/Previous | venj-bw2-i:ShareInResultsParticipatingInterests | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r20.c2 | Share in results of participating interests/Current | venj-bw2-i:ShareInResultsParticipatingInterests | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r21.c0 | Result after tax/Current | venj-bw2-i:ResultAfterTax | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r21.c1 | Result after tax/Previous | venj-bw2-i:ResultAfterTax | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r21.c2 | Result after tax/Current | venj-bw2-i:ResultAfterTax | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r22.c0 | Result attributable to non-controlling interest/Current | venj-bw2-i:ResultAttributableNoncontrollingInterest | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r22.c1 | Result attributable to non-controlling interest/Previous | venj-bw2-i:ResultAttributableNoncontrollingInterest | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r22.c2 | Result attributable to non-controlling interest/Current | venj-bw2-i:ResultAttributableNoncontrollingInterest | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r23.c0 | Sum of results/Current | ocw-i:SumOfResults | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r23.c1 | Sum of results/Previous | ocw-i:SumOfResults | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:ActualsMember | xs:date('2016-01-01')/xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r23.c2 | Sum of results/Current | ocw-i:SumOfResults | nl-types:monetaryNoDecimalsItemType | duration | ocw-dm:EstimatesMember | xs:date('2017-01-01')/xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |