Cover - shares	6 Months Ended
	Mar. 31, 2022	May 05, 2022
Cover [Abstract]
Entity Registrant Name	TANICO INC.
Entity Central Index Key	0001895939
Document Type	10-Q
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Document Period End Date	Mar. 31, 2022
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Entity Common Stock Shares Outstanding		6,150,000
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	333-261643
Entity Incorporation State Country Code	NV
Entity Tax Identification Number	37-2002382
Entity Address Address Line 1	387 Whitby Shores Greenway
Entity Address City Or Town	Whitby
Entity Address Country	CA
Entity Address Postal Zip Code	L1N 9R6
City Area Code	775
Local Phone Number	404-0333
Entity Interactive Data Current	Yes
Entity Address State Or Province	ON