EARNINGS PER SHARE (EPS) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Common shares outstanding (in shares)	57,032	56,684	57,032	56,684
Unallocated ESOP shares (in shares)	(1,769)	(1,961)	(1,769)	(1,961)
Non-vested restricted stock (in shares)	(3,533)	(3,822)	(3,533)	(3,822)
Impact of weighted average shares (in shares)	(62)	(63)	(307)	(184)
Weighted average shares outstanding - basic (in shares)	51,668	50,838	51,423	50,717
Incremental shares from stock based compensation (in shares)	1,762	2,426	2,179	2,494
Weighted average shares outstanding - diluted (in shares)	53,430	53,264	53,602	53,211