| r0.c0 | Revaluation reserve realised, specification total/Revaluation reserve realised | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimals20ItemType | duration | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:ExpensesSpecificationComponentMember | * | N/A |
| r0.c1 | Revaluation reserve realised, specification total/Revaluation reserve realised | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimals20ItemType | duration | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:ExpensesSpecificationComponentMember | * | N/A |
| r0.c2 | Revaluation reserve realised, specification total/Current | | | | N/A | N/A | N/A | * | xs:date('2020-01-01')/xs:date('2020-12-31') |
| r0.c3 | Revaluation reserve realised, specification total/Previous | | | | N/A | N/A | N/A | * | xs:date('2019-01-01')/xs:date('2019-12-31') |
| r1.c0 | ocw-table_ExpensesRevaluationReserveRealisedSpecification-y/Revaluation reserve realised | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimals20ItemType | duration | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:ExpensesSpecificationComponentMember | * | N/A |
| r1.c1 | ocw-table_ExpensesRevaluationReserveRealisedSpecification-y/Revaluation reserve realised | ocw-i:RevaluationReserveRealised | nl-types:monetaryNoDecimals20ItemType | duration | jenv-bw2-dm:ConsolidatedMember | ocw-dm:ActualsMember | ocw-dm:ExpensesSpecificationComponentMember | * | N/A |
| r1.c2 | ocw-table_ExpensesRevaluationReserveRealisedSpecification-y/Current | | | | N/A | N/A | N/A | * | xs:date('2020-01-01')/xs:date('2020-12-31') |
| r1.c3 | ocw-table_ExpensesRevaluationReserveRealisedSpecification-y/Previous | | | | N/A | N/A | N/A | * | xs:date('2019-01-01')/xs:date('2019-12-31') |