EARNINGS PER COMMON SHARE ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic income per common share:
Net income attributable to Pathward Financial, Inc.	$ 45,096	$ 22,391	$ 127,709	$ 132,966
Dividends and undistributed earnings allocated to participating securities	(690)	(377)	(1,920)	(2,166)
Basic net earnings available to common stockholders	44,406	22,014	125,789	130,800
Undistributed earnings allocated to nonvested restricted stockholders	670	352	1,858	2,093
Reallocation of undistributed earnings to nonvested restricted stockholders	(667)	(352)	(1,852)	(2,092)
Diluted net earnings available to common stockholders	$ 44,409	$ 22,014	$ 125,795	$ 130,801
Total weighted average common shares outstanding (in shares)	26,346,693	28,868,136	27,152,773	29,444,979
Effect of dilutive securities
Total effect of dilutive securities (in shares)	100,339	0	86,028	9,607
Weighted average dilutive common shares outstanding (in shares)	26,447,032	28,868,136	27,238,801	29,454,586
Net earnings per common share:
Basic income per common share (in dollars per share)	$ 1.69	$ 0.76	$ 4.63	$ 4.44
Diluted income per common share (in dollars per share)	$ 1.68	$ 0.76	$ 4.62	$ 4.44
Weighted average shares of nonvested restricted stock, antidilutive (in shares)	409,666	493,800	414,539	487,538
Performance share units
Effect of dilutive securities
Outstanding options - based upon the two-class method (in shares)	100,339	0	86,028	9,607