Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2025	May 12, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Mar. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Entity Information [Line Items]
Entity Registrant Name	M3-BRIGADE ACQUISITION V CORP.
Entity Central Index Key	0002016072
Entity File Number	001-42171
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	E9
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Incorporation, Date of Incorporation	Mar. 12, 2024
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	1700 Broadway
Entity Address, Address Line Two	19th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
Entity Phone Fax Numbers [Line Items]
City Area Code	(212)
Local Phone Number	202-2200
Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant
Entity Listings [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant
Trading Symbol	MBAVU
Security Exchange Name	NASDAQ
Class A ordinary shares, par value $0.0001 per share
Entity Listings [Line Items]
Title of 12(b) Security	Class A ordinary shares, par value $0.0001 per share
Trading Symbol	MBAV
Security Exchange Name	NASDAQ
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Entity Listings [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Trading Symbol	MBAVW
Security Exchange Name	NASDAQ
Class A Ordinary Shares
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		28,750,000
Class B Ordinary Shares
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		7,187,500

M3-Brigade Acquisition V Corp. 10-Q