| Document and Entity Information | Apr. 19, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 19, 2022 |
| Entity Registrant Name | PLUM ACQUISITION CORP. I |
| Entity Incorporation, State or Country Code | E9 |
| Entity File Number | 001-40218 |
| Entity Tax Identification Number | 98-1577353 |
| 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 | 415 |
| Local Phone Number | 683-6773 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001840317 |
| Capital Units [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A Ordinary Share, $0.0001 par value, and one-fifth of one redeemable warrant |
| Trading Symbol | PLMIU |
| Security Exchange Name | NASDAQ |
| Class A Ordinary Shares [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A Ordinary Shares included as part of the units |
| Trading Symbol | PLMI |
| Security Exchange Name | NASDAQ |
| Warrants included as part of the units, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants included as part of the units, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 |
| Trading Symbol | PLMIW |
| Security Exchange Name | NASDAQ |
