Cover - shares	9 Months Ended
	Jan. 31, 2025	Feb. 20, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jan. 31, 2025
Document Transition Report	false
Entity File Number	001-39744
Entity Registrant Name	C3.ai, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-3999357
Entity Address, Address Line One	1400 Seaport Blvd
Entity Address, City or Town	Redwood City,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94063
City Area Code	650
Local Phone Number	503-2200
Title of 12(b) Security	Class A Common Stock, par value $0.001 per share
Trading Symbol	AI
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
Current Fiscal Year End Date	--04-30
Amendment Flag	false
Entity Central Index Key	0001577526
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		129,238,730
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		3,499,992