CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT (Parentheticals)	Mar. 31, 2026 shares
Class B Ordinary Shares
Ordinary share	750,000

Number of outstanding common shares of an entity that are subjected to forfeiture.

No definition available.

Name:	mcga_CommonStockSubjectToForfeitureSharesOutstanding
Namespace Prefix:	mcga_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant