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Significant Accounting Policies - Schedule of Class A Ordinary Shares Subject to Possible Redemption Reflected in the Balance Sheet are Reconciled (Details) - USD ($)		3 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Schedule Of Class AOrdinary Shares Subject To Possible Redemption Reflected In The Balance Sheet Are Reconciled Abstract
Gross proceeds from Initial Public Offering	$ 201,250,000
Proceeds allocated to Public Rights	(4,361,306)
Offering costs allocated to Class A ordinary shares subject to possible redemption	(13,262,661)
Accretion of Class A ordinary shares subject to possible redemption	17,945,104
Class A ordinary shares subject to possible redemption at June 30, 2025	$ 201,571,137	$ (17,945,104)

X

- Definition

The amount of accretion of Class A ordinary shares subject to possible redemption.

+ References

No definition available.

+ Details

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Namespace Prefix:	bacc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of offering costs allocated to Class A ordinary shares subject to possible redemption.

+ References

No definition available.

+ Details

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Namespace Prefix:	bacc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of proceeds allocated to public rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	bacc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	bacc_
Data Type:	xbrli:stringItemType
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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

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)(d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

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