EARNINGS PER SHARE (EPS) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Common shares outstanding	47,425	46,801	47,425	46,801
Unallocated ESOP shares	(2,108)	(2,314)	(2,108)	(2,314)
Non-vested restricted stock	(3,555)	(3,426)	(3,555)	(3,426)
Impact of weighted average shares	(50)	(94)	(279)	(173)
Weighted average shares outstanding - basic	41,712	40,967	41,483	40,888
Incremental shares from stock based compensation	2,062	2,197	2,335	1,761
Weighted average shares outstanding - diluted	43,774	43,164	43,818	42,649