Commitments and Contingencies (Details) $ in Millions, € in Billions		1 Months Ended				3 Months Ended		25 Months Ended
	Feb. 15, 2023 officer_and_director plaintiff	Jul. 31, 2024 USD ($) phase	Apr. 30, 2024 USD ($)	Jul. 31, 2022 USD ($)	Feb. 29, 2020	Jul. 31, 2024 USD ($) phase	Jul. 31, 2023 USD ($) phase	Jun. 28, 2024 claim	Feb. 27, 2024 EUR (€)	Jan. 31, 2024 phase	Apr. 30, 2023 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		7				7	5			6	4	3	2
Decrease in right-of-use asset						$ 1.3
Decrease 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
Enel Global Services S.R.L And Any Involved Corporate Affiliates ("Enel") | Pending Litigation
Long-term Purchase Commitment [Line Items]
Unrecorded amount | €									€ 2.1
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
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 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						9.4	$ 7.2
Remaining contractual commitment		54.0				54.0
Professional Services, October 2023-October 2026
Long-term Purchase Commitment [Line Items]
Purchase commitment, at least		$ 42.0
Purchase commitment, term		3 years
Purchase commitment, incurred cost						4.9
Remaining contractual commitment		$ 34.6				34.6
Professional Services, January 2024-January 2026
Long-term Purchase Commitment [Line Items]
Purchase commitment, at least			$ 31.0
Purchase commitment, term			2 years
Purchase commitment, incurred cost						4.9
Remaining contractual commitment		$ 22.6				$ 22.6