Private Placement - Additional Information (Detail)	3 Months Ended
Mar. 31, 2025 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Class of warrant or right, number of securities called by warrants or rights	300,000
Class of warrant or right, price of warrants or rights \| $ / shares	$ 10
Warrant exercisable period after initial business combination	30 days
Warrants and Rights Outstanding \| $	$ 3,000,000
Sponsor [Member] \| Private Placement Units [Member]
Subsidiary, Sale of Stock [Line Items]
Class of warrant or right, outstanding	50,000
Sponsor [Member] \| Founder Shares [Member]
Subsidiary, Sale of Stock [Line Items]
Class of warrant or right, outstanding	200,000
IPO [Member] \| BTIG LLC [Member]
Subsidiary, Sale of Stock [Line Items]
Under writers investment value during initial public offering \| $	$ 500,000
Private Placement Warrants [Member] \| Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Class of warrant or right, exercise price of warrants or rights \| $ / shares	$ 11.5

Class of warrant or right, price of warrants or rights.

No definition available.

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- Definition

Under writers investment value during initial public offering.

+ References

No definition available.

+ Details

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- Definition

Warrant exercisable period after initial business combination

+ References

No definition available.

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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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.

+ Details

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Details

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- Details

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