v3.26.1
Cover
Apr. 07, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 07, 2026
Entity File Number 001-40677
Entity Registrant Name PLUM ACQUISITION CORP. III
Entity Central Index Key 0001845550
Entity Tax Identification Number 98-1581691
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 2021 Fillmore St. #2089
Entity Address, City or Town San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94115
City Area Code 929
Local Phone Number 529-7125
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false