Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2024	May 16, 2024
Document Information Line Items
Entity Registrant Name	ONYX ACQUISITION CO. I
Document Type	10-Q/A
Current Fiscal Year End Date	--12-31
Amendment Flag	true
Amendment Description	This Form 10-Q/A Amendment No. 1 (the “Amendment”) to the Quarterly Report on Form 10-Q for the period ended March 31, 2024 (the “Original 10-Q”) is being filed solely to amend and restate “Item 6. Exhibits” for the purpose of filing updated certifications of our principal executive officer and principal financial officer as Exhibits 31.1 and 31.2 (the “302 Certifications”), pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, to include inadvertently omitted disclosure.This Amendment contains only the Cover Page, the Explanatory Note, Item 6. Exhibits, the Signature Page and the corrected 302 Certifications.Other than as expressly set forth herein, this Amendment does not, and does not purport to, amend, update or restate the information in the Original 10-Q or reflect any events that have occurred after the Original 10-Q was filed. Information not affected by this Amendment remains unchanged and reflects the disclosures made at the time as of which the Original 10-Q was filed. This Amendment should be read together with the Original 10-Q and our other filings with the Securities and Exchange Commission.
Entity Central Index Key	0001849548
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	true
Entity Ex Transition Period	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-41003
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1584432
Entity Address, Address Line One	104 5th Avenue
Entity Address, State or Province	NY
Entity Address, City or Town	New York
Entity Address, Postal Zip Code	10011
City Area Code	(212)
Local Phone Number	974-2844
Entity Interactive Data Current	Yes
Units, each consisting of one Class A Ordinary Share, $0.0001 par value, and one-half of one redeemable warrant
Document Information Line Items
Trading Symbol	ONYXU
Title of 12(b) Security	Units, each consisting of one Class A Ordinary Share, $0.0001 par value, and one-half of one redeemable warrant
Security Exchange Name	NASDAQ
Class A Ordinary Shares
Document Information Line Items
Trading Symbol	ONYX
Entity Common Stock, Shares Outstanding		7,945,461
Title of 12(b) Security	Class A Ordinary Shares
Security Exchange Name	NASDAQ
Redeemable warrants, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50
Document Information Line Items
Trading Symbol	ONYXW
Title of 12(b) Security	Redeemable warrants, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50
Security Exchange Name	NASDAQ
Class B Ordinary Shares
Document Information Line Items
Entity Common Stock, Shares Outstanding		0

Onyx Acquisition Co. I 10-Q/A