Condensed Balance Sheet (Unaudited)	Sep. 30, 2025 USD ($)
Current assets
Cash	$ 1,399,715
Prepaid expenses	20,175
Total current assets	1,419,890
Marketable securities held in Trust Account	287,523,851
Total Assets	288,943,741
Current liabilities
Accrued offering costs	80,500
Accrued expenses	5,593
Advance from related party	22,500
Total current liabilities	108,593
Deferred underwriting fee	12,250,000
Total Liabilities	12,358,593
Shareholders’ Deficit
Preference shares, $0.0001 par value; 5,000,000 shares authorized; none issued or outstanding
Additional paid-in capital
Accumulated deficit	(10,939,422)
Total Shareholders’ Deficit	(10,938,703)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption, and Shareholders’ Deficit	288,943,741
Class A Ordinary Shares
Current liabilities
Class A ordinary shares subject to possible redemption, 28,750,000 shares at redemption value of $10.00 per share	287,523,851
Shareholders’ Deficit
Ordinary shares, value
Class B Ordinary Shares
Shareholders’ Deficit
Ordinary shares, value	$ 719

The amount of accrued offering costs. .

No definition available.

Name:	fcrsu_AccruedOfferingCosts
Namespace Prefix:	fcrsu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).