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Liabilities for puttable financial instrument - Schedule of liabilities for puttable financial instrument (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Liabilities For Puttable Financial Instrument [Abstract]
Balance at January 1	$ 14,309	$ 14,623
Change in fair value recognized in equity	211	(314)
Eliminated on disposal of a subsidiary	(14,520)	0
Balance at December 31	$ 0	$ 14,309

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- Definition

The increase (decrease) in the fair value measurement of liabilities. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e&doctype=Standard
-URIDate 2025-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Current Liabilities For Puttable Financial Instrument

+ References

No definition available.

+ Details

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Namespace Prefix:	pre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Decrease Through Loss Of Control Of Subsidiary, Financial Liabilities

+ References

No definition available.

+ Details

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Namespace Prefix:	pre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Liabilities For Puttable Financial Instrument

+ References

No definition available.

+ Details

Name:	pre_LiabilitiesForPuttableFinancialInstrumentAbstract
Namespace Prefix:	pre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration