Cover Page - shares	6 Months Ended
	Sep. 30, 2022	Oct. 31, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-38312
Entity Registrant Name	8x8, INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	COMMON STOCK, PAR VALUE $.001 PER SHARE
Trading Symbol	EGHT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		111,688,301
Entity Central Index Key	0001023731
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023