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Financial Assets and Liabilities - Schedule of Allowance for Expected Credit Losses (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Schedule Of Allowance For Expected Credit Losses Abstract |  |
Opening ECL Allowance | € 9 |
ECL allowance- Juve Stabia acquisition | 253 |
Increase in lifetime ECL - charged to profit or loss | 1,540 | 9
Write-offs during the year (against ECL) | (913) |
Total ECL Allowance | € 889 | € 9

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Data Type: | xbrli:monetaryItemType
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- Definition Increase in lifetime ECL – charged to profit or loss. + References No definition available. + Details
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Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Opening ECL allowance. + References No definition available. + Details
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Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Write-offs during the year (against ECL). + References No definition available. + Details
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Namespace Prefix: | brer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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