Commitments and Contingencies (Details) $ in Millions		1 Months Ended			3 Months Ended			6 Months Ended		11 Months Ended
	Feb. 15, 2023 plaintiff officer_and_director	Oct. 31, 2023 USD ($) phase	Jul. 31, 2022 USD ($)	Feb. 29, 2020	Oct. 31, 2023 USD ($) phase	Jul. 31, 2023 USD ($)	Oct. 31, 2022 USD ($) phase	Oct. 31, 2023 USD ($) phase	Oct. 31, 2022 USD ($) phase	Apr. 19, 2023 claim	Apr. 30, 2023 USD ($) 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		3	5	3		4	2
Operating lease, liability						$ 2.0
Operating lease, right-of-use assets						1.7
Decrease in right-of-use asset						1.6
Decrease in lease liability						$ 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					8.6		$ 1.3	$ 15.8	$ 1.6
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					$ 0.0