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Consolidated Statements of Financial Position (Parentheticals) - Total for all related parties [member] - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts receivable and other receivables, including related parties | € 91 | € 8
Prepaid expenses and other current assets, including related parties | 622 | 295
Prepayment for digital assets, including related party | 28,680 | 0
Digital assets, including related parties | 78,174 | 0
Accounts payable and other payables, including related parties | € 345 | € 177

X
- Definition The amount of accounts payable and other payables. + References No definition available. + Details
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Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of accounts receivable and other receivables. + References No definition available. + Details
Name: | brer_AccountsReceivableAndOtherReceivables
Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of digital assets. + References No definition available. + Details
Name: | brer_DigitalAssets
Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of prepaid expenses and other current assets. + References No definition available. + Details
Name: | brer_PrepaidExpensesAndOtherCurrentAssets
Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of prepayment for digital assets. + References No definition available. + Details
Name: | brer_PrepaymentForDigitalAsset
Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_RelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |