v3.25.4
Cover - shares
 6 Months Ended
Sep. 30, 2025
Feb. 19, 2026
Document Information Line Items    
Entity Registrant Name PIERMONT VALLEY ACQUISITION CORP.  
Entity Central Index Key 0001865248  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Entity Small Business true  
Entity Shell Company true  
Entity Emerging Growth Company true  
Entity Current Reporting Status No  
Document Period End Date Sep. 30, 2025  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Entity Ex Transition Period false  
Entity Common Stock Shares Outstanding   5,952,885
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-41108  
Entity Incorporation State Country Code E9  
Entity Tax Identification Number 98-1598114  
Entity Address Address Line 1 732 S. 6th Street  
Entity Address Address Line 2 #5386  
Entity Address City Or Town Las Vegas  
Entity Address State Or Province NV  
Entity Address Postal Zip Code 89101  
City Area Code 929  
Local Phone Number 792-5788  
Entity Interactive Data Current No  
Units, each consisting of one Class A ordinary share    
Document Information Line Items    
Security 12b Title Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant  
Trading Symbol CMCAU  
Class A ordinary shares, par value    
Document Information Line Items    
Security 12b Title Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol CMCAF  
One Warrant Exercisable For One Class A Ordinary Share Member    
Document Information Line Items    
Security 12b Title Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol CMCAW