Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-36089
Entity Registrant Name	RingCentral, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3322844
Entity Address, Address Line One	20 Davis Drive
Entity Address, City or Town	Belmont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94002
City Area Code	650
Local Phone Number	472-4100
Title of 12(b) Security	Class A Common Stock
Trading Symbol	RNG
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
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001384905
Current Fiscal Year End Date	--12-31
Class A common stock
Document Information [Line Items]
Entity Common Stock Outstanding (in shares)		79,327,759
Class B common stock
Document Information [Line Items]
Entity Common Stock Outstanding (in shares)		10,303,948