Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Nov. 26, 2018	Mar. 31, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	META FINANCIAL GROUP INC
Entity Central Index Key	0000907471
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 979.7
Entity Common Stock, Shares Outstanding		39,406,938
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false