EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Common Share, Basic and Diluted [Abstract]
Net income attributable to Meta Financial Group, Inc.	$ 21,068	$ 15,398
Weighted average common shares outstanding (in shares)	37,431,788	39,335,054
Basic income per common share (in dollars per share)	$ 0.56	$ 0.39
Outstanding options - based upon the two-class method (in shares)	34,090	71,453
Weighted average common and dilutive potential common shares outstanding (in shares)	37,465,878	39,406,507
Diluted income per common share (in dollars per share)	$ 0.56	$ 0.39