| r0.c0 | Number of new buildings sale/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsSaleNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c1 | Number of new buildings sale/First forecast year | bzk-aw-wsw-i:NewBuildingsSaleNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c2 | Number of new buildings sale/Second forecast year | bzk-aw-wsw-i:NewBuildingsSaleNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c3 | Number of new buildings sale/Third forecast year | bzk-aw-wsw-i:NewBuildingsSaleNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c4 | Number of new buildings sale/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsSaleNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r0.c5 | Number of new buildings sale/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsSaleNumber | xbrli:nonNegativeIntegerItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c0 | Sale foundation costs new buildings sale/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsSaleFoundationExpensesIncludingLandAndSalesExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c1 | Sale foundation costs new buildings sale/First forecast year | bzk-aw-wsw-i:NewBuildingsSaleFoundationExpensesIncludingLandAndSalesExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c2 | Sale foundation costs new buildings sale/Second forecast year | bzk-aw-wsw-i:NewBuildingsSaleFoundationExpensesIncludingLandAndSalesExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c3 | Sale foundation costs new buildings sale/Third forecast year | bzk-aw-wsw-i:NewBuildingsSaleFoundationExpensesIncludingLandAndSalesExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c4 | Sale foundation costs new buildings sale/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsSaleFoundationExpensesIncludingLandAndSalesExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r1.c5 | Sale foundation costs new buildings sale/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsSaleFoundationExpensesIncludingLandAndSalesExpenses | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c0 | Income of new buildings sale/Forecast reporting year | bzk-aw-wsw-i:NewBuildingsSaleIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodCurrentStartDateParam/$FinancialReportingPeriodCurrentEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c1 | Income of new buildings sale/First forecast year | bzk-aw-wsw-i:NewBuildingsSaleIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFirstPeriodStartDateParam/$FinancialReportingPeriodFirstPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c2 | Income of new buildings sale/Second forecast year | bzk-aw-wsw-i:NewBuildingsSaleIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodSecondPeriodStartDateParam/$FinancialReportingPeriodSecondPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c3 | Income of new buildings sale/Third forecast year | bzk-aw-wsw-i:NewBuildingsSaleIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodThirdPeriodStartDateParam/$FinancialReportingPeriodThirdPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c4 | Income of new buildings sale/Fourth forecast year | bzk-aw-wsw-i:NewBuildingsSaleIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFourthPeriodStartDateParam/$FinancialReportingPeriodFourthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |
| r2.c5 | Income of new buildings sale/Fifth forecast year | bzk-aw-wsw-i:NewBuildingsSaleIncome | nl-types:monetaryNoDecimalsItemType | duration | $FinancialReportingPeriodFifthPeriodStartDateParam/$FinancialReportingPeriodFifthPeriodEndDateParam | $BasisOfPreparationParam | bzk-ti-dm:NonDAEBActivitiesMember |