Cover - USD ($)	12 Months Ended
	Sep. 30, 2021	Dec. 16, 2022	Mar. 31, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--09-30
Entity File Number	005-87668
Entity Registrant Name	PEAK PHARMACEUTICALS, INC.
Entity Central Index Key	0001452804
Entity Tax Identification Number	26-1973257
Entity Incorporation, State or Country Code	NV
Entity Address, Address Line One	14201 N. Hayden Road
Entity Address, Address Line Two	Suite A-1
Entity Address, City or Town	Scottsdale
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85260
City Area Code	(480)
Local Phone Number	659-6404
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	No
Entity Interactive Data Current	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	true
Entity Public Float			$ 8,949,300
Entity Common Stock, Shares Outstanding		78,363,567
Auditor Name	Friedman LLP
Auditor Location	Marlton, New Jersey