Cover Page - shares	3 Months Ended
	Mar. 31, 2020	May 13, 2020
Document Information [Line Items]
Document Type	10-Q
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Registrant Name	Oaktree Acquisition Corp.
Entity Central Index Key	0001773751
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Address, State or Province	CA
Common Class A [Member]
Document Information [Line Items]
Trading Symbol	OAC
Security Exchange Name	NYSE
Title of 12(b) Security	Class A ordinary share, par value $0.0001 per share
Entity Common Stock, Shares Outstanding		20,125,000
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,031,250
Capital Units [Member]
Document Information [Line Items]
Trading Symbol	OAC.U
Security Exchange Name	NYSE
Title of 12(b) Security	Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant
Warrant [Member]
Document Information [Line Items]
Trading Symbol	OAC WS
Security Exchange Name	NYSE
Title of 12(b) Security	Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50