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Related party transactions - Others (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Related party transactions
Interest expense charged by a related party	$ 801	$ 769

X

- Definition

The amount of interest expense charged by related party.

+ References

No definition available.

+ Details

Name:	bwlp_InterestExpenseRelatedPartyTransactions
Namespace Prefix:	bwlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration