Cover - USD ($)	12 Months Ended
	Sep. 30, 2020	Feb. 04, 2022	Mar. 31, 2020
Cover [Abstract]
Entity Registrant Name	Barrel Energy Inc.
Entity Central Index Key	0001631463
Document Type	10-K
Amendment Flag	false
Entity Voluntary Filers	No
Current Fiscal Year End Date	--09-30
Entity Well Known Seasoned Issuer	No
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Current Reporting Status	No
Document Period End Date	Sep. 30, 2020
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Ex Transition Period	false
Entity Common Stock Shares Outstanding		312,694,984
Entity Public Float			$ 204,945
Document Annual Report	true
Document Transition Report	false
Entity Incorporation State Country Code	NV
Entity Tax Identification Number	47-1963189
Entity Address Address Line 1	8275 S. Eastern Ave
Entity Address Address Line 2	Suite 200
Entity Address City Or Town	Las Vegas
Entity Address State Or Province	NV
Entity Address Postal Zip Code	89123
City Area Code	702
Local Phone Number	595-2247
Entity Interactive Data Current	No