| r0.c0 | Gross trade receivables/Current | rj-i:TradeReceivablesGross | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r0.c1 | Gross trade receivables/Previous | rj-i:TradeReceivablesGross | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r1.c0 | Provision bad debts on trade receivables/Current | rj-i:TradeReceivablesProvisionBadDebts | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r1.c1 | Provision bad debts on trade receivables/Previous | rj-i:TradeReceivablesProvisionBadDebts | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r2.c0 | Net trade receivables/Current | rj-i:TradeReceivablesNet | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r2.c1 | Net trade receivables/Previous | rj-i:TradeReceivablesNet | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r3.c0 | Current receivables from group companies/Current | venj-bw2-i:ReceivablesGroupCompaniesCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r3.c1 | Current receivables from group companies/Previous | venj-bw2-i:ReceivablesGroupCompaniesCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r4.c0 | Current receivables from other related parties/Current | venj-bw2-i:ReceivablesOtherRelatedPartiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r4.c1 | Current receivables from other related parties/Previous | venj-bw2-i:ReceivablesOtherRelatedPartiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r5.c0 | Current receivables from shareholders and participating interests/Current | venj-bw2-i:ReceivablesShareholdersParticipatingInterestsCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r5.c1 | Current receivables from shareholders and participating interests/Previous | venj-bw2-i:ReceivablesShareholdersParticipatingInterestsCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r6.c0 | Current receivables from loans and advances to participants or registered shareholders/Current | venj-bw2-i:ReceivablesFromLoansAndAdvancesToParticipantsOrRegisteredShareholdersCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r6.c1 | Current receivables from loans and advances to participants or registered shareholders/Previous | venj-bw2-i:ReceivablesFromLoansAndAdvancesToParticipantsOrRegisteredShareholdersCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r7.c0 | Loans, advances and guarantees on behalf of managing directors and former managing directors/Current | rj-i:LoansAdvancesGuaranteesOnBehalfOfManagingDirectorsFormerManagingDirectors | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r7.c1 | Loans, advances and guarantees on behalf of managing directors and former managing directors/Previous | rj-i:LoansAdvancesGuaranteesOnBehalfOfManagingDirectorsFormerManagingDirectors | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r8.c0 | Loans, advances and guarantees on behalf of supervisory directors and former supervisory directors/Current | rj-i:LoansAdvancesGuaranteesOnBehalfOfSupervisoryDirectorsFormerSupervisoryDirectors | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r8.c1 | Loans, advances and guarantees on behalf of supervisory directors and former supervisory directors/Previous | rj-i:LoansAdvancesGuaranteesOnBehalfOfSupervisoryDirectorsFormerSupervisoryDirectors | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r9.c0 | Current other receivables/Current | venj-bw2-i:ReceivablesOtherCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r9.c1 | Current other receivables/Previous | venj-bw2-i:ReceivablesOtherCurrent | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r10.c0 | Called-up share capital/Current | venj-bw2-i:CalledUpShareCapital | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r10.c1 | Called-up share capital/Previous | venj-bw2-i:CalledUpShareCapital | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r11.c0 | Pension receivables/Current | rj-i:PensionReceivables | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r11.c1 | Pension receivables/Previous | rj-i:PensionReceivables | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r12.c0 | Tax receivables/Current | rj-i:TaxReceivables | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r12.c1 | Tax receivables/Previous | rj-i:TaxReceivables | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r13.c0 | Prepayments and accrued income/Current | venj-bw2-i:AccruedIncome | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r13.c1 | Prepayments and accrued income/Previous | venj-bw2-i:AccruedIncome | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r14.c0 | Trade and other receivables/Current | rj-i:TradeOtherReceivables | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |
| r14.c1 | Trade and other receivables/Previous | rj-i:TradeOtherReceivables | nl-types:monetaryNoDecimalsItemType | instant | $FinancialReportingPeriodPreviousEndDateParam | $BasisOfPreparationParam | venj-bw2-dm:ConsolidatedMember |