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Trade and other receivables and deferred expenses - Narrative (Details) | 12 Months Ended
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Dec. 31, 2025
Bottom |
Disclosure of financial assets [line items] |
Trade receivables period | 30 days
Top of range |
Disclosure of financial assets [line items] |
Trade receivables period | 90 days

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Trade Receivables, Period + References No definition available. + Details
Name: | pre_TradeReceivablesPeriod
Namespace Prefix: | pre_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |