XML 90 R21.htm IDEA: XBRL DOCUMENT
v3.24.1.1.u2

DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2024 USD ($) | Feb. 09, 2024 USD ($) | Feb. 17, 2023 USD ($) $ / shares shares | Feb. 14, 2023 USD ($) shares | Nov. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) $ / shares shares | Feb. 14, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / shares shares | Nov. 13, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares
DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Condition For Future Business Combination Number Of Businesses Minimum |  |  |  |  |  | 1 |  |  | 1 |  |
Proceeds from Issuance Initial Public Offering |  |  |  |  |  | $ 0 |  | $ 59,670,000 | $ 59,670,000 |  |
Number of Shares Issued Per Unit (in Shares) | shares |  |  |  |  |  | 1 |  |  | 1 |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001
Percentage Of Trust Account Required For Business Combination |  |  |  |  |  | 80.00% |  |  | 80.00% |  |
Threshold Percentage Of Outstanding Voting Securities Of Target To Be Acquired By Post Transaction Company To Complete Business Combination |  |  |  |  |  | 50.00% |  |  | 50.00% |  |
Asset, Held-in-Trust |  |  |  |  |  | $ 70,207,500 |  |  | $ 70,207,500 |  |
Debt Instrument, Redemption, Description |  |  |  |  |  | The Company will provide its holders of the outstanding shares of its Common Stock sold in the Initial Public Offering (the “Public Stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek stockholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Stockholders will be entitled to redeem their Public Shares (as described in Note 1) for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.175 per Public Share plus any pro rata interest then in the Trust Account, net of taxes payable). The per share amount to be distributed to Public Stockholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 5). |  |  | The Company will provide its holders of the outstanding shares of its Common Stock sold in the Initial Public Offering (the “Public Stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek stockholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Stockholders will be entitled to redeem their Public Shares (as described in Note 1) for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.175 per Public Share plus any pro rata interest then in the Trust Account, net of taxes payable). The per share amount to be distributed to Public Stockholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 5). |  |
Redemption Limit Percentage |  |  |  |  |  | 15.00% |  |  | 15.00% |  |
Percentage Obligation To Redeem Public Shares If Entity Does Not Complete Business Combination |  |  |  |  |  | 100.00% |  |  | 100.00% |  |
Maximum Allowed Dissolution Expenses |  |  |  |  |  | $ 100,000 |  |  | $ 100,000 |  |
Cash |  |  |  |  |  | 3,637 |  |  | 15,419 |  | $ 124,501
Debt, Current |  |  |  |  |  | 2,676,899 |  |  | 2,015,645 |  |
Net Tangible Assets |  |  |  |  |  | $ 5,000,001 |  |  | $ 5,000,001 |  |
Period To Consummate Business Combination |  |  |  |  |  | 9 months |  |  | 9 months |  |
Common stock, shares outstanding | shares |  |  |  |  |  | 2,155,000 | 3,432,046 |  | 2,155,000 |  | 1,725,000
Temporary Equity, Redemption Price Per Share | $ / shares |  |  |  |  |  |  | $ 10.49 |  |  |  |
Temporary Equity, Par Value |  |  |  |  |  |  | $ 35,995,728 |  |  |  |
Common Stock, Value, Outstanding |  |  |  |  |  |  | 36,372,335 |  |  |  |
Interest Income Held in The Trust Account |  |  |  |  | $ 561,957 |  | $ 561,957 |  |  |  |
Investment of Cash in Trust Account |  |  |  |  |  |  |  |  |  | $ 180,000 |
Cash deposited in Trust Account | $ 60,000 | $ 60,000 |  |  |  | $ 120,000 |  | 70,207,500 | $ 70,207,500 |  |
Unsecured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 60,000 | $ 75,000 |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Shares, New Issues (in Shares) | shares |  |  |  | 6,000,000 |  | 6,900,000 |  |  | 6,900,000 |  |
Proceeds from Issuance Initial Public Offering |  |  |  | $ 60,000,000 |  |  |  |  |  |  |
Share Price (in Dollars per share) | $ / shares |  |  |  |  |  | $ 10 |  |  | $ 10 |  |
Number of Shares Issued Per Unit (in Shares) | shares |  |  |  |  |  | 1 |  |  | 1 |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |
Number of Warrants Issued Per Unit (in Shares) | shares |  |  |  |  |  | 1 |  |  | 1 |  |
Number of Rights Issued Per Unit (in Shares) | shares |  |  |  |  |  | 1 |  |  | 1 |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Unit, Issued (in Shares) | shares |  |  | 900,000 |  |  |  |  |  |  |  |
Share Price (in Dollars per share) | $ / shares |  |  | $ 10 |  |  |  |  |  |  |  |
Common Unit, Issuance Value |  |  | $ 9,000,000 |  |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS AND BASIS OF PRESENTATION (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Unit, Issued (in Shares) | shares |  |  | 430,000 |  |  | 430,000 |  |  | 430,000 |  |
Share Price (in Dollars per share) | $ / shares |  |  | $ 10 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Limited Partners Units |  |  | $ 4,300,000 |  |  | $ 0 |  | $ 4,300,000 | $ 4,300,000 |  |
Number of Shares Issued Per Unit (in Shares) | shares |  |  | 1 |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares |  |  | $ 0.0001 |  |  | $ 9.5 |  |  | $ 9.5 |  |
Number of Warrants Issued Per Unit (in Shares) | shares |  |  | 1 |  |  |  |  |  |  |  |
Number of Rights Issued Per Unit (in Shares) | shares |  |  | 1 |  |  |  |  |  |  |  |

X
- Definition Cash deposited in the trust account. + References No definition available. + Details
Name: | blacu_CashDepositedInTheTrustAccount
Namespace Prefix: | blacu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_ConditionForFutureBusinessCombinationNumberOfBusinessesMinimum
Namespace Prefix: | blacu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | blacu_DESCRIPTIONOFORGANIZATIONBUSINESSOPERATIONSANDBASISOFPRESENTATIONDetailsLineItems
Namespace Prefix: | blacu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest income held in the trust account. + References No definition available. + Details
Name: | blacu_InterestIncomeHeldInTheTrustAccount
Namespace Prefix: | blacu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment of cash in trust account. + References No definition available. + Details
Name: | blacu_InvestmentOfCashInTrustAccount
Namespace Prefix: | blacu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | blacu_MaximumAllowedDissolutionExpenses
Namespace Prefix: | blacu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net tangible assets. + References No definition available. + Details
Name: | blacu_NetTangibleAssets
Namespace Prefix: | blacu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | blacu_NumberOfRightsIssuedPerUnit
Namespace Prefix: | blacu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_NumberOfSharesIssuedPerUnit
Namespace Prefix: | blacu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_NumberOfWarrantsIssuedPerUnit
Namespace Prefix: | blacu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_PercentageObligationToRedeemPublicSharesIfEntityDoesNotCompleteBusinessCombination
Namespace Prefix: | blacu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_PercentageOfTrustAccountRequiredForBusinessCombination
Namespace Prefix: | blacu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period to consummate business combination. + References No definition available. + Details
Name: | blacu_PeriodToConsummateBusinessCombination
Namespace Prefix: | blacu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_RedemptionLimitPercentage
Namespace Prefix: | blacu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_ThresholdPercentageOfOutstandingVotingSecuritiesOfTargetToBeAcquiredByPostTransactionCompanyToCompleteBusinessCombination
Namespace Prefix: | blacu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | blacu_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | blacu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_AssetsHeldInTrust
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-12 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480555/946-210-45-21 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 20 -SubTopic 210 -Topic 946 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480555/946-210-45-20 + Details
Name: | us-gaap_Cash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockValueOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stated value of common units of ownership issued by a limited liability company (LLC). + References No definition available. + Details
Name: | us-gaap_CommonUnitIssuanceValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of common units issued of limited liability company (LLC). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_CommonUnitIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of debt and lease obligation, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482949/835-30-55-8 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Description of debt redemption features under terms of the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph e -SubTopic 470 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480848/942-470-50-3 + Details
Name: | us-gaap_DebtInstrumentRedemptionDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the issuance of common limited partners units during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480244/480-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (27) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_TemporaryEquityRedemptionPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount of the par value of temporary equity outstanding. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480244/480-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (27) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=blacu_UnsecuredPromissoryNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |