| Document and Entity Information | Sep. 04, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 04, 2024 |
| Entity Registrant Name | VAXCYTE, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39323 |
| Entity Tax Identification Number | 46-4233385 |
| Entity Address Address Line 1 | 825 Industrial Road |
| Entity Address Address Line 2 | Suite 300 |
| Entity Address City Or Town | San Carlos |
| Entity Address State Or Province | CA |
| Entity Address Postal Zip Code | 94070 |
| City Area Code | 650 |
| Local Phone Number | 837-0111 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 par value per share |
| Trading Symbol | PCVX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001649094 |
| Amendment Flag | false |
