| r0.c0 | Advances received for projects, specification total/Construction contracts (liabilities) | rj-i:ConstructionContractsLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | ocw-dm:LiabilitiesCurrentSpecificationComponentMember | * | N/A | venj-bw2-dm:SeparateMember |
| r0.c1 | Advances received for projects, specification total/Construction contracts (liabilities) | rj-i:ConstructionContractsLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | ocw-dm:LiabilitiesCurrentSpecificationComponentMember | * | N/A | venj-bw2-dm:SeparateMember |
| r0.c2 | Advances received for projects, specification total/Current | | | | N/A | N/A | * | xs:date('2017-12-31') | N/A |
| r0.c3 | Advances received for projects, specification total/Previous | | | | N/A | N/A | * | xs:date('2016-12-31') | N/A |
| r1.c0 | ocw-table_NotesLiabilitiesCurrentAdvancesReceivedProjectsSpecification-y/Construction contracts (liabilities) | rj-i:ConstructionContractsLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | ocw-dm:LiabilitiesCurrentSpecificationComponentMember | * | N/A | venj-bw2-dm:SeparateMember |
| r1.c1 | ocw-table_NotesLiabilitiesCurrentAdvancesReceivedProjectsSpecification-y/Construction contracts (liabilities) | rj-i:ConstructionContractsLiabilities | nl-types:monetaryNoDecimalsItemType | instant | ocw-dm:ActualsMember | ocw-dm:LiabilitiesCurrentSpecificationComponentMember | * | N/A | venj-bw2-dm:SeparateMember |
| r1.c2 | ocw-table_NotesLiabilitiesCurrentAdvancesReceivedProjectsSpecification-y/Current | | | | N/A | N/A | * | xs:date('2017-12-31') | N/A |
| r1.c3 | ocw-table_NotesLiabilitiesCurrentAdvancesReceivedProjectsSpecification-y/Previous | | | | N/A | N/A | * | xs:date('2016-12-31') | N/A |