Related party transactions, Transactions Between Group and Related Parties on Commercial Terms Agreed by Parties (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Purchase of services [Abstract]
Support service fees paid/payable to a related corporation	$ 6,313	$ 6,122
Rental paid/payable to a related corporation	893	872
Rendering of services [Abstract]
Management fees received/receivable from related corporations	$ 4	$ 657

No definition available.

Name:	hafn_PurchaseOfServicesAbstract
Namespace Prefix:	hafn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	hafn_RenderingOfServicesAbstract
Namespace Prefix:	hafn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of rental paid or payable in related party transactions.

+ References

No definition available.

+ Details

Name:	hafn_RentalPaidOrPayableRelatedPartyTransactions
Namespace Prefix:	hafn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 21
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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

- Definition

The amount of services received in related party transactions. [Refer: Total for all related parties [member]]

+ References

+ Details

Name:	ifrs-full_ServicesReceivedRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration