Cover - USD ($)	12 Months Ended
	Jun. 30, 2021	Oct. 11, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--06-30
Entity Registrant Name	PETRO USA, INC.
Entity Central Index Key	0000745543
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float		$ 12,721
Entity Common Stock, Shares Outstanding		30,920