v3.25.4
Cover
Feb. 24, 2026
Document Information Line Items  
Entity Registrant Name Piermont Valley Acquisition Corp
Entity Central Index Key 0001865248
Document Type 8-K
Amendment Flag false
Entity Emerging Growth Company true
Document Period End Date Feb. 24, 2026
Entity Ex Transition Period 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 St
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Units, each consisting of one Class A ordinary share [Member]  
Document Information Line Items  
Security 12b Title Units, each consisting of one Class A ordinary share, par value $0.0001, and one-half of one redeemable warrant
Trading Symbol CMCAU
Class A ordinary shares, par value [Member]  
Document Information Line Items  
Security 12b Title Class A ordinary shares, par value $0.0001 per share
Trading Symbol CMCAF
Warrants, each whole warrant exercisable for one Class A ordinary share [Member]  
Document Information Line Items  
Security 12b Title Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share
Trading Symbol CMCAW