| Document and Entity Information | Nov. 29, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001023731 |
| Document Type | 8-K |
| Document Period End Date | Nov. 29, 2022 |
| Entity Registrant Name | 8x8, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38312 |
| Entity Tax Identification Number | 77-0142404 |
| Entity Address, Address Line One | 675 Creekside Way |
| Entity Address, City or Town | Campbell |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95008 |
| City Area Code | (408) |
| Local Phone Number | 727-1885 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | COMMON STOCK, PAR VALUE $.001 PER SHARE |
| Trading Symbol | EGHT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
