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Trade and other receivables - Contract Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Contract Assets [Roll Forward]
Beginning balance	$ 13,269
Additions to contract assets	1,375
Invoiced during the year	(2,320)
Impaired during the year	(9,178)
Ending balance	$ 3,146

X

- Definition

Contract Assets

+ References

No definition available.

+ Details

Name:	bldp_ContractAssetsRollForward
Namespace Prefix:	bldp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Decrease Through Invoicing, Contract Assets

+ References

No definition available.

+ Details

Name:	bldp_DecreaseThroughInvoicingContractAssets
Namespace Prefix:	bldp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of current contract assets. [Refer: Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CurrentContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The decrease in contract assets resulting from impairment. [Refer: Contract assets; Impairment loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_118_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- Definition

The increase (decrease) in contract assets resulting from cumulative catch-up adjustments to revenue. [Refer: Contract assets; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_118_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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