v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
May 13, 2026
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, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name LAFAYETTE DIGITAL ACQUISITION CORP. I  
Entity Central Index Key 0002087447  
Entity File Number 001-43050  
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 Address, Address Line One 201 South Biscayne Blvd  
Entity Address, Address Line Two 28th Floor  
Entity Address, City or Town Miami  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33131  
City Area Code (305)  
Local Phone Number 913-8999  
Units, each consisting of one Class A ordinary share and one-fourth of one redeemable warrant    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-fourth of one redeemable warrant  
Trading Symbol ZKPU  
Security Exchange Name NASDAQ  
Class A ordinary shares, par value $0.0001 per share    
Document Information [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol ZKP  
Security Exchange Name NASDAQ  
Warrants, each whole warrant exercisable for one Class A ordinary share    
Document Information [Line Items]    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share  
Trading Symbol ZKPW  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   29,510,000
Class B Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   9,583,333