Segment Reporting - Additional Information (Detail)	9 Months Ended
Segment Reporting - Additional Information (Detail)	Sep. 30, 2025 SEGMENT
Segment Reporting [Abstract]
Number of reportable segments	1
Segment reporting, description	The CODMs assess performance for the single segment and determine how to allocate resources based on net income or loss that also is reported on the condensed consolidated statements of operations as net income or loss. The measure of segment assets is reported on the condensed consolidated balance sheets as total assets.
segment reporting CODM profit loss measure how used description	The key measures of segment profit or loss reviewed by the CODMs are general and administrative costs. General and administrative costs are reviewed and monitored by the CODMs to manage and forecast cash to ensure enough capital is available to complete a Business Combination within the Combination Period. The CODMs also review general and administrative costs to manage, maintain and enforce all contractual agreements to ensure costs are aligned with all agreements and budget.

Churchill Capital Corp X/Cayman 10-Q