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Commitments and Contingencies (Details) - USD ($)			3 Months Ended	10 Months Ended
	Jun. 20, 2024	Jun. 14, 2024	Mar. 31, 2025	Dec. 31, 2024
Commitments and Contingencies [Line Items]
Underwriters options			45 days
Purchase price per unit (in Dollars per share)			$ 10.38
Cash underwriting discount			$ 4,000,000
Deferred underwriting discount percentage			4.00%
Legal fees			$ 225,000	$ 175,000
Deferred legal fees			175,000	$ 125,000
Business Combination [Member]
Commitments and Contingencies [Line Items]
Payments for other fees			$ 50,000
Over-Allotment Option [Member]
Commitments and Contingencies [Line Items]
Additional units issued (in Shares)	3,000,000		3,000,000
Purchase price per unit (in Dollars per share)	$ 10
Gross proceeds percentage of IPO			2.00%
Sold pursuant			6.00%
Aggregate underwriters		$ 9,800,000

X

- Definition

Additional units issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	cubwu_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of Aggregate underwriters.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred legal fees.

+ References

No definition available.

+ Details

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X

- Definition

Deferred underwriting discount.

+ References

No definition available.

+ Details

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X

- Definition

Gross proceeds percentage of IPO.

+ References

No definition available.

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X

- Definition

Sold pursuant.

+ References

No definition available.

+ Details

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X

- Definition

Underwriters Options.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (k)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cash outflow for fees classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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- Details

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