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Trade and other receivables and deferred expenses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022
Minimum
Disclosure of financial assets [line items]
Trade receivables period	30 days
Maximum
Disclosure of financial assets [line items]
Trade receivables period	60 days

X

- 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

X

- Definition

Period of trade receivables due.

+ References

No definition available.

+ Details

Name:	pre_TradeReceivablesPeriod
Namespace Prefix:	pre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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