| r0.c0 | Intangible assets/Current | venj-bw2-i:IntangibleAssets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r0.c1 | Intangible assets/Previous | venj-bw2-i:IntangibleAssets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r1.c0 | Property, plant and equipment/Current | venj-bw2-i:PropertyPlantEquipment | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r1.c1 | Property, plant and equipment/Previous | venj-bw2-i:PropertyPlantEquipment | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r2.c0 | Financial assets/Current | venj-bw2-i:FinancialAssets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r2.c1 | Financial assets/Previous | venj-bw2-i:FinancialAssets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r3.c0 | Non-current assets/Current | venj-bw2-i:AssetsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r3.c1 | Non-current assets/Previous | venj-bw2-i:AssetsNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r4.c0 | Non-current assets [title]/Current | venj-bw2-abstr:BW2AssetsNoncurrentTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r4.c1 | Non-current assets [title]/Previous | venj-bw2-abstr:BW2AssetsNoncurrentTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r5.c0 | Inventories/Current | venj-bw2-i:Inventories | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r5.c1 | Inventories/Previous | venj-bw2-i:Inventories | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r6.c0 | Receivables/Current | venj-bw2-i:Receivables | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r6.c1 | Receivables/Previous | venj-bw2-i:Receivables | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r7.c0 | Current securities/Current | venj-bw2-i:SecuritiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r7.c1 | Current securities/Previous | venj-bw2-i:SecuritiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r8.c0 | Cash and cash equivalents/Current | venj-bw2-i:CashAndCashEquivalents | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r8.c1 | Cash and cash equivalents/Previous | venj-bw2-i:CashAndCashEquivalents | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r9.c0 | Current assets/Current | venj-bw2-i:AssetsCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r9.c1 | Current assets/Previous | venj-bw2-i:AssetsCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r10.c0 | Current assets [title]/Current | venj-bw2-abstr:BW2AssetsCurrentTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r10.c1 | Current assets [title]/Previous | venj-bw2-abstr:BW2AssetsCurrentTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r11.c0 | Assets/Current | venj-bw2-i:Assets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r11.c1 | Assets/Previous | venj-bw2-i:Assets | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r12.c0 | Assets [title]/Current | venj-bw2-abstr:BW2AssetsTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r12.c1 | Assets [title]/Previous | venj-bw2-abstr:BW2AssetsTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r13.c0 | Equity/Current | venj-bw2-i:Equity | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r13.c1 | Equity/Previous | venj-bw2-i:Equity | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r14.c0 | Provisions/Current | venj-bw2-i:Provisions | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r14.c1 | Provisions/Previous | venj-bw2-i:Provisions | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r15.c0 | Non-current liabilities/Current | venj-bw2-i:LiabilitiesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r15.c1 | Non-current liabilities/Previous | venj-bw2-i:LiabilitiesNoncurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r16.c0 | Current liabilities/Current | venj-bw2-i:LiabilitiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r16.c1 | Current liabilities/Previous | venj-bw2-i:LiabilitiesCurrent | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r17.c0 | Equity and liabilities/Current | venj-bw2-i:EquityAndLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r17.c1 | Equity and liabilities/Previous | venj-bw2-i:EquityAndLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |
| r18.c0 | Equity and liabilities [title]/Current | venj-bw2-abstr:BW2EquityAndLiabilitiesTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2017-12-31') | venj-bw2-dm:SeparateMember |
| r18.c1 | Equity and liabilities [title]/Previous | venj-bw2-abstr:BW2EquityAndLiabilitiesTitle | xbrli:stringItemType | duration | ocw-dm:ActualsMember | xs:date('2016-12-31') | venj-bw2-dm:SeparateMember |