CONDENSED CONSOLIDATED BALANCE SHEET - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Current assets
Cash	$ 60,261	$ 212,099
Prepaid expenses - current	225,000	191,667
Total current assets	285,261	403,766
Non-current assets
Investments held in Trust Account	177,932,677	176,338,275
Prepaid expenses - non-current	38,521	78,833
Total non-current assets	177,971,198	176,417,108
Total Assets	178,256,459	176,820,874
Current liabilities
Accrued expenses	2,249,022	1,826,861
Due to related party	$ 15,000	$ 45,000
Other Liability, Current, Related Party [Extensible Enumeration]	Related Party	Related Party
Promissory note - related party	$ 250,000
Notes Payable, Current, Related Party [Extensible Enumeration]	Related Party
Accounts payable	$ 30,209	$ 180,140
Total current liabilities	2,544,231	2,052,001
Non-current liabilities
Deferred underwriting commissions	5,175,000	5,175,000
Total non-current liabilities	5,175,000	5,175,000
Total Liabilities	7,719,231	7,227,001
Commitments and Contingencies (Note 7)
Class A Ordinary Shares subject to possible redemption, $0.0001 par value; 17,250,000 shares issued and outstanding at redemption value of $10.31 and $10.22 per share at March 31, 2026 and December 31, 2025, respectively	177,932,677	176,338,275
Shareholders' Deficit
Preference shares, $0.0001 par value; 1,000,000 shares authorized; none issued and outstanding at March 31, 2026 and December 31, 2025
Accumulated deficit	(7,396,082)	(6,745,035)
Total Shareholders' Deficit	(7,395,449)	(6,744,402)
Total Liabilities, Class A Ordinary Shares Subject to Redemption, and Shareholders' Deficit	178,256,459	176,820,874
Class A Ordinary Shares
Shareholders' Deficit
Ordinary shares value	58	58
Class B Ordinary Shares
Shareholders' Deficit
Ordinary shares value	$ 575	$ 575

Amount of deferred underwriting commissions.

No definition available.

Name:	mcga_DeferredUnderwritingCommissions
Namespace Prefix:	mcga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).