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| | concept | venj-bw2-i:Inventories | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:Inventories | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-abstr:BW2InventoriesTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-abstr:BW2InventoriesTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:TradeReceivables | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:TradeReceivables | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesOCWAndEZCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesOCWAndEZCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesLocalGovernmentCommonRegulationsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesLocalGovernmentCommonRegulationsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:ReceivablesGroupCompaniesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:ReceivablesGroupCompaniesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesOtherParticipatingInterestsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesOtherParticipatingInterestsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesEmployeesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesEmployeesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesParentsStudentsAndCourseParticipantsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesParentsStudentsAndCourseParticipantsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesGovernmentOtherCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesGovernmentOtherCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | rj-i:ConstructionContractsAssets | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | rj-i:ConstructionContractsAssets | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:ReceivablesOtherCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:ReceivablesOtherCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesProvisionBadDebts | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesProvisionBadDebts | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:ReceivablesCurrentExcludingAccruedIncomeSubtotal | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:ReceivablesCurrentExcludingAccruedIncomeSubtotal | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:TaxesSocialSecurityContributionsReceivableCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:TaxesSocialSecurityContributionsReceivableCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:AdvancesPaidPrepayments | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:AdvancesPaidPrepayments | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:AdvancesPaidPeriodicPayments | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:AdvancesPaidPeriodicPayments | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:InterestReceivable | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:InterestReceivable | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:AccruedIncomeOther | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:AccruedIncomeOther | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:AccruedIncome | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:AccruedIncome | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-abstr:AccruedIncomeTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-abstr:AccruedIncomeTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:Receivables | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:Receivables | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-abstr:BW2ReceivablesTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-abstr:BW2ReceivablesTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:SharesOtherVariableYieldSecuritiesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:SharesOtherVariableYieldSecuritiesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:BondsOtherFixedIncomeSecuritiesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:BondsOtherFixedIncomeSecuritiesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:SecuritiesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:SecuritiesCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | kvk-abstr:SecuritiesTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | kvk-abstr:SecuritiesTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:Cash | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:Cash | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:BankAccountsBalance | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:BankAccountsBalance | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:Deposits | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:Deposits | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | ocw-i:TreasuryBanking | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | ocw-i:TreasuryBanking | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:CashAndCashEquivalents | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:CashAndCashEquivalents | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | kvk-abstr:CashAndCashEquivalentsTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | kvk-abstr:CashAndCashEquivalentsTitle | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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| | concept | venj-bw2-i:AssetsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2017-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
| | concept | venj-bw2-i:AssetsCurrent | y | | ocw-dim:ActualsEstimatesAxis | ocw-dm:ActualsMember | x | | period | xs:date('2016-12-31') | x | | venj-bw2-dim:FinancialStatementsTypeAxis | venj-bw2-dm:SeparateMember | x |
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