Commitment and Contingencies (Details) $ in Millions, € in Billions		1 Months Ended				12 Months Ended		22 Months Ended
	Feb. 15, 2023 plaintiff officer_and_director	Apr. 30, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Feb. 29, 2020	Apr. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Mar. 26, 2024 claim	Feb. 27, 2024 EUR (€)
The Reckstin Family Trust v. C3.ai, Inc. | Settled Litigation
Long-term Purchase Commitment [Line Items]
Number of additional plaintiffs | plaintiff	3
Number of current and former officers and directors | officer_and_director	4
Suri V. Siebel Et Al., Rabasca V. Siebel Et Al., Vo V. Siebel Et Al, Lanfair V. Siebel Et Al. And Pankow V. Siebel Et Al. | Pending Litigation
Long-term Purchase Commitment [Line Items]
Number of actions filed | claim								5
Enel | Pending Litigation
Long-term Purchase Commitment [Line Items]
Gain contingency, compensatory damages sought | €									€ 2.1
C3.ai DTI Grants Program
Long-term Purchase Commitment [Line Items]
Grants, payment period (in years)					5 years
Grants, potential remaining contributions		$ 31.6				$ 31.6	$ 31.6
Cloud Services, July 2022-July 2025
Long-term Purchase Commitment [Line Items]
Purchase commitment				$ 100.0
Purchase commitment, term (in years)				3 years
Purchase commitment, incurred cost						31.8	$ 8.3
Professional Services, October 2023-April 2025
Long-term Purchase Commitment [Line Items]
Purchase commitment			$ 15.0
Purchase commitment, term (in years)			18 months
Purchase commitment, incurred cost						7.8
Professional Services, January 2024-January 2026
Long-term Purchase Commitment [Line Items]
Purchase commitment		$ 31.0
Purchase commitment, term (in years)		2 years
Purchase commitment, incurred cost						$ 3.5