Represent the amount of cash placed outside trust account and is available for working capital purposes.

No definition available.

Name:	bracu_CashHeldOutsideOfTrustAccount
Namespace Prefix:	bracu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents a description of proceed with business combination.

+ References

No definition available.

+ Details

Name:	bracu_DescriptionOfProceedWithBusinessCombination
Namespace Prefix:	bracu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount represents as a payments to costs of liquidating.

+ References

No definition available.

+ Details

Name:	bracu_PaymentsToCostsOfLiquidating
Namespace Prefix:	bracu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

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Namespace Prefix:	bracu_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from various types of offering issuance.

+ References

No definition available.

+ Details

Name:	bracu_ProceedsFromIssuanceOfferingNet
Namespace Prefix:	bracu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from issuance from offering held in trust account.

+ References

No definition available.

+ Details

Name:	bracu_ProceedsFromOfferingHeldInTrustAccount
Namespace Prefix:	bracu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after proceeds from underwriter option.

+ References

No definition available.

+ Details

Name:	bracu_SaleOfStockConsiderationReceivedOnUnderwriterOption
Namespace Prefix:	bracu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	bracu_ShareUnitExercisePrice
Namespace Prefix:	bracu_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bracu_BlackRidgeOilAndGasIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
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Description of Organization and Business Operations (Details Narrative) - USD ($)					5 Months Ended
	Oct. 18, 2017	Oct. 10, 2017	Oct. 04, 2017	May 31, 2017	Sep. 30, 2017
Costs of liquidating					$ 50,000
Description of proceed with business combination					The Company will proceed with a Business Combination only if the Company has net tangible assets of at least $5,000,001 upon such consummation of a Business Combination and in the case of a stockholder vote, a majority of the outstanding shares voted are voted in favor of the Business Combination.
Subsequent Event [Member]
Number of units issued in transaction (in aggregate)	13,800,000
Proceeds from held in trust (in dollars per unit)	$ 10.05	$ 10.05
Warrant exercise price (in dollars per share)	$ 11.50
Gross proceeds from offering	$ 18,450,000
Net proceeds from offering	18,090,000
Proceeds from offering held in trust account	138,690,000	$ 120,600,000
Over allotment gross proceeds	3,241,119
Underwriting fees	2,760,000
Cash held outside of the Trust Account		$ 540,229
Black Ridge Oil & Gas, Inc ("Sponsor") [Member]
Number of units issued in transaction (in aggregate)				2,875,000
Black Ridge Oil & Gas, Inc ("Sponsor") [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)			575,000
Initial Public Offering [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)		12,000,000	10,000,000
Gross proceeds from issuance offering		$ 120,000,000
Over allotment gross proceeds	$ 481,119
Private Placement [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)	45,000	400,000
Gross proceeds from issuance of private placement (in aggregate)		$ 4,000,000
Private Placement [Member] \| Maximum [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)		600,000
Private Placement [Member] \| Black Ridge Oil & Gas, Inc ("Sponsor") [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)	445,000	400,000
Unit price (in dollars per unit)	$ 10.00	$ 10.00
Warrant exercise price (in dollars per share)	$ 11.50
Gross proceeds from issuance of private placement (in aggregate)	$ 4,450,000	$ 4,000,000
Over-Allotment Option [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)	1,800,000
Unit price (in dollars per unit)	$ 10.00
Proceeds from held in trust (in dollars per unit)	10.05
Warrant exercise price (in dollars per share)	$ 11.50
Unit exercise price (in dollars per unit)		$ 11.50
Gross proceeds from issuance of private placement (in aggregate)	$ 18,000,000
Gross proceeds from offering	360,000
Proceeds from underwriter option	100	$ 100
Net proceeds from offering	$ 6,900,000
Over-Allotment Option [Member] \| Maximum [Member] \| Subsequent Event [Member]
Number of units issued in transaction (in aggregate)	600,000
Unit price (in dollars per unit)	$ 11.50