| r0.c0 | New buildings housing facilities were sold under conditions/Current | bzk-ti-i:HousingFacilitiesSoldUnderConditionsNewBuildings | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodCurrentEndDateParam |
| r0.c1 | New buildings housing facilities were sold under conditions/Previous | bzk-ti-i:HousingFacilitiesSoldUnderConditionsNewBuildings | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodPreviousEndDateParam |
| r1.c0 | Existing housing facilities were sold under conditions/Current | bzk-ti-i:HousingFacilitiesSoldUnderConditionsExistingBuildings | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodCurrentEndDateParam |
| r1.c1 | Existing housing facilities were sold under conditions/Previous | bzk-ti-i:HousingFacilitiesSoldUnderConditionsExistingBuildings | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodPreviousEndDateParam |
| r2.c0 | Housing facilities were sold under conditions/Current | bzk-ti-i:HousingFacilitiesSoldUnderConditions | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodCurrentEndDateParam |
| r2.c1 | Housing facilities were sold under conditions/Previous | bzk-ti-i:HousingFacilitiesSoldUnderConditions | xbrli:nonNegativeIntegerItemType | instant | $BasisOfPreparationParam | jenv-bw2-dm:SeparateMember | $FinancialReportingPeriodPreviousEndDateParam |