v3.25.1
Cover - shares
 3 Months Ended
Mar. 31, 2025
Jun. 02, 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 New Providence Acquisition Corp. III/Cayman  
Entity Central Index Key 0002048948  
Entity File Number 001-42610  
Entity Tax Identification Number 98-1834924  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status No  
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 Dec. 04, 2024  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 401 S County Road #2588  
Entity Address, City or Town Palm Beach  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33480  
Entity Phone Fax Numbers [Line Items]    
City Area Code (561)  
Local Phone Number 231-7070  
Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant  
Trading Symbol NPACU  
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 NPAC  
Security Exchange Name NASDAQ  
Redeemable 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 Redeemable Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Trading Symbol NPACW  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   30,887,075
Class B Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   7,503,750