The amount of an allowance account used to record impairments to financial assets due to credit losses.

No definition available.

Name:	blsh_AllowanceForCreditLossesFinancialAssets
Namespace Prefix:	blsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The allowance for credit losses for modified digital asset loans.

+ References

No definition available.

+ Details

Name:	blsh_AllowanceForCreditLossesModifiedDigitalAssetLoan
Namespace Prefix:	blsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of Default, past due and write-off of the principle amount of the loans.

+ References

No definition available.

+ Details

Name:	blsh_DefaultPastDueAndWriteoffOfPrinciple
Namespace Prefix:	blsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The gain (loss) on customers' digital assets.

+ References

No definition available.

+ Details

Name:	blsh_GainLossOnCustomersDigitalAssets
Namespace Prefix:	blsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage change in price of digital assets used to measure risk exposure.

+ References

No definition available.

+ Details

Name:	blsh_RiskExposureOfDigitalAssetsChangeInPricePercent
Namespace Prefix:	blsh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk exposure of digital assets during a twelve month period.

+ References

No definition available.

+ Details

Name:	blsh_RiskExposureOfDigitalAssetsDuringTwelveMonthPeriod
Namespace Prefix:	blsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the basis point used to determine variance in assessing risk exposure of net income.

+ References

No definition available.

+ Details

Name:	blsh_RiskExposureOfNetIncomeBasisPointVariancePoint
Namespace Prefix:	blsh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk exposure of net income during a 12 month period.

+ References

No definition available.

+ Details

Name:	blsh_RiskExposureOfNetIncomeDuring12MonthPeriod
Namespace Prefix:	blsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	blsh_Statement1LineItems
Namespace Prefix:	blsh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in equity resulting from the conversion of convertible instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 106
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2024-03-27

+ Details

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

- Definition

The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_TransfersOutOfLevel2IntoLevel1OfFairValueHierarchyAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=blsh_ClassBPreferenceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=blsh_CreditLineFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=blsh_MarginLendingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 26 - Financial Risk Management (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Aug. 01, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement Line Items [Line Items]
Allowance for credit losses, financial assets		$ 0	$ 0	$ 0
Increase (decrease) through conversion of convertible instruments, equity		0
Gain (loss) on customers' digital assets		$ 0	$ 0
Risk exposure of digital assets, change in price, percent		50.00%	50.00%
Risk exposure of digital assets during twelve month period		$ 1,294,100	$ 1,342,000
Risk exposure of net income, basis point variance point		0.0050	0.0050
Risk exposure of net income during 12 month period		$ 3,700	$ 600
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period		358,200
Class B preference shares [member]
Statement Line Items [Line Items]
Increase (decrease) through conversion of convertible instruments, equity	$ (47,900)
Credit line facility [member]
Statement Line Items [Line Items]
Allowance for credit losses, financial assets		0	0
Margin lending services [member]
Statement Line Items [Line Items]
Allowance for credit losses, financial assets		0	0
Default, past due and write-off of principle		0	0
Allowance for credit losses, modified digital asset loan		$ 0	$ 0