Minimum value of consummation of inital business combination.

No definition available.

Name:	cccxu_MinimumValueOfConsummationOfInitalBusinessCombination
Namespace Prefix:	cccxu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Under writers investment value during initial public offering.

+ References

No definition available.

+ Details

Name:	cccxu_UnderWritersInvestmentValueDuringInitialPublicOffering
Namespace Prefix:	cccxu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Underwriters deferred fee.

+ References

No definition available.

+ Details

Name:	cccxu_UnderwritersDeferredFee
Namespace Prefix:	cccxu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Underwriters received upfront compensation expense.

+ References

No definition available.

+ Details

Name:	cccxu_UnderwritersReceivedUpfrontCompensationExpense
Namespace Prefix:	cccxu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of authorized capital units or capital shares. This element is relevant to issuers of face-amount certificates and registered investment companies.

+ References

No definition available.

+ Details

Name:	us-gaap_CapitalUnitsAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash or stock or unit payment to a limited liability corporation managing member or limited partnership general partner after the end of the accounting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 72
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-72

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-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482635/260-10-55-103

+ Details

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

- Definition

Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(7)(b))
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-Topic 944
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-Section 25
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477550/944-720-25-2

+ Details

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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 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_
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

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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Period Type:	duration

- Details

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Balance Type:
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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Subsequent Events - Additional Information (Detail) - USD ($)			3 Months Ended
	May 15, 2025	May 14, 2025	Mar. 31, 2025
Subsequent Event [Line Items]
Underwriters deferred fee			$ 3,000,000
Minimum value of consummation of initial business combination			100,000,000
Managing member or general partner subsequent distribution amount		$ 30,000
Promissory Note [Member]
Subsequent Event [Line Items]
Repayments of debt			420,673
Minimum [Member]
Subsequent Event [Line Items]
Other Underwriting Expense			1,500,000
Maximum [Member]
Subsequent Event [Line Items]
Other Underwriting Expense			$ 3,000,000
IPO [Member]
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction			5,400,000
Proceeds from issuance initial public offering			$ 414,000,000
Private Placement [Member]
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction			300,000
Proceeds from issuance of private placement			$ 3,000,000
Common Class B [Member] \| IPO [Member]
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction	41,400,000
Founder Shares [Member]
Subsequent Event [Line Items]
Underwriters received upfront compensation expense			360,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Capital units authorized	41,400,000
Sale of stock, number of shares issued in transaction	414,000,000
Subsequent Event [Member] \| IPO [Member]
Subsequent Event [Line Items]
Proceeds from issuance initial public offering	$ 414,000,000
Subsequent Event [Member] \| Private Placement [Member]
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction	300,000
Proceeds from issuance of private placement	$ 3,000,000
Subsequent Event [Member] \| Common Class B [Member] \| IPO [Member]
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction	5,400,000
Proceeds from issuance initial public offering	$ 414,000,000
BTIG LLC [Member] \| IPO [Member]
Subsequent Event [Line Items]
Under writers investment value during initial public offering			$ 500,000
Sponsor [Member] \| Private Placement Units [Member]
Subsequent Event [Line Items]
Class of warrant or right, outstanding			50,000
Sponsor [Member] \| Founder Shares [Member]
Subsequent Event [Line Items]
Class of warrant or right, outstanding			200,000