v3.25.4
Cover - shares
 9 Months Ended
Dec. 31, 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 Dec. 31, 2025  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2026  
Entity Ex Transition Period false  
Entity Common Stock Shares Outstanding   5,952,885
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  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current No  
Units Each Consisting Of One Share Of Class Common Stock And One Half Of One Warrant [Member]    
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