| Document and Entity Information | Oct. 23, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 23, 2024 |
| Entity Registrant Name | GENERATION ASIA I ACQUISITION LIMITED |
| Entity Incorporation, State or Country Code | E9 |
| Entity File Number | 001-41239 |
| Entity Tax Identification Number | 98-1588665 |
| Entity Address, Address Line One | Boundary Hall |
| Entity Address, Address Line Two | Cricket Square |
| Entity Address, City or Town | Grand Cayman |
| Entity Address, Country | KY |
| Entity Address, Postal Zip Code | KY1-1102 |
| City Area Code | 345 |
| Local Phone Number | 814-5580 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Central Index Key | 0001852061 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Class A ordinary shares |
| Trading Symbol | GAQ |
| Security Exchange Name | NASDAQ |
