Commitments and Contingencies (Details) $ in Millions, € in Billions		1 Months Ended	3 Months Ended			6 Months Ended		25 Months Ended
	Feb. 15, 2023 officer_and_director plaintiff	Feb. 29, 2020	Oct. 31, 2024 USD ($)	Jul. 31, 2024 USD ($) phase	Oct. 31, 2023 USD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jun. 28, 2024 claim	Apr. 30, 2024 USD ($)	Feb. 27, 2024 EUR (€)	Jan. 31, 2024 phase	Jul. 31, 2023 phase	Apr. 30, 2023 phase	Oct. 31, 2022 phase	Jan. 31, 2022 phase	Aug. 25, 2021 ft²
Long-term Purchase Commitment [Line Items]
Purchase commitment, incurred cost			$ 25.6		$ 8.6	$ 44.8	$ 15.8
Lease, area under lease | ft²																283,015
Lease, number of phases | phase				7							6	5	4	3	2
Increase in right-of-use asset				$ 1.3
Increase in lease liability				$ 1.3
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., Pankow V. Seibel Et Al., Rosenfeld V. Siebel Et Al. | Pending Litigation
Long-term Purchase Commitment [Line Items]
Number of actions filed | claim								6
Enel Global Services S.R.L And Any Involved Corporate Affiliates ("Enel") | Pending Litigation
Long-term Purchase Commitment [Line Items]
Unrecorded amount | €										€ 2.1
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
Cloud Hosting Services
Long-term Purchase Commitment [Line Items]
Remaining contractual commitment			355.0			355.0
Professional services
Long-term Purchase Commitment [Line Items]
Remaining contractual commitment			$ 43.5			$ 43.5
Professional services | Minimum
Long-term Purchase Commitment [Line Items]
Purchase commitment, term						1 year
Professional services | Maximum
Long-term Purchase Commitment [Line Items]
Purchase commitment, term						5 years