Commitments and Contingencies (Details) $ in Millions		1 Months Ended				3 Months Ended			9 Months Ended		11 Months Ended
	Feb. 15, 2023 officer_and_director plaintiff	Jan. 31, 2024 USD ($) phase	Oct. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Feb. 29, 2020	Jan. 31, 2024 USD ($) phase	Jul. 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Jan. 31, 2024 USD ($) phase	Jan. 31, 2023 USD ($)	Apr. 19, 2023 claim	Apr. 30, 2023 USD ($) phase	Oct. 31, 2022 phase	Jan. 31, 2022 phase	Aug. 25, 2021 ft²
Long-term Purchase Commitment [Line Items]
Lease, area under lease | ft²															283,015
Lease, number of phases | phase		5				5			5			4	3	2
Operating lease, liability		$ 47.4				$ 47.4	$ 2.0		$ 47.4
Operating lease, right-of-use assets		17.2				17.2	1.7		17.2
Decrease in right-of-use asset						1.7	1.6
Decrease in lease liability						1.7	$ 1.6
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. 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					5 years
Grants, potential remaining contributions		31.6				31.6			31.6			$ 31.6
Cloud Services, July 2022-July 2025
Long-term Purchase Commitment [Line Items]
Purchase commitment, at least				$ 100.0
Purchase commitment, term				3 years
Purchase commitment, incurred cost						7.7		$ 2.3	23.5	$ 3.9
Professional Services, October 2023-April 2025
Long-term Purchase Commitment [Line Items]
Purchase commitment, at least			$ 15.0
Purchase commitment, term			18 months
Purchase commitment, incurred cost						0.2			0.2
Professional Services, January 2024-January 2025
Long-term Purchase Commitment [Line Items]
Purchase commitment, at least		$ 13.0
Purchase commitment, incurred cost						$ 0.7			$ 1.2