Commitment and Contingencies (Details)		1 Months Ended			11 Months Ended	12 Months Ended
	Feb. 15, 2023 officerAndDirector plaintiff	Jul. 31, 2022 USD ($)	Feb. 29, 2020	Nov. 30, 2019 USD ($)	Apr. 19, 2023 claim	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)
Long-term Purchase Commitment [Line Items]
Purchase commitment, incurred cost						$ 14,800,000	$ 13,900,000	$ 14,300,000
The Reckstin Family Trust v. C3.ai, Inc. | Pending Litigation
Long-term Purchase Commitment [Line Items]
Number of additional plaintiffs | plaintiff	3
Number of current and former officers and directors | officerAndDirector	4
Suri V. Siebel Et Al., Rabasca V. Siebel Et Al. And Vo V. Siebel Et Al | Pending Litigation
Long-term Purchase Commitment [Line Items]
Number of actions filed | claim					3
C3.ai DTI Grants Program
Long-term Purchase Commitment [Line Items]
Grants, payment period (in years)			5 years
Grants, potential remaining contributions						31,600,000	$ 31,600,000
Web-Hosting Services, November 2019-November 2022
Long-term Purchase Commitment [Line Items]
Purchase commitment				$ 30,000,000
Purchase commitment, term (in years)				3 years
Web-Hosting Services, November 2020
Long-term Purchase Commitment [Line Items]
Purchase commitment				$ 10,000,000
Web-Hosting Services, November 2021
Long-term Purchase Commitment [Line Items]
Purchase commitment				10,000,000
Web-Hosting Services, November 2022
Long-term Purchase Commitment [Line Items]
Purchase commitment				$ 10,000,000
Cloud Services, July 2022-July 2025
Long-term Purchase Commitment [Line Items]
Purchase commitment		$ 100,000,000
Purchase commitment, term (in years)		3 years
Purchase commitment, incurred cost						$ 8,300,000