EARNINGS PER SHARE - Basic and diluted EPS from continuing operations (Details) - shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Common shares outstanding (in shares)	53,062,000	57,064,000	56,613,000
Unallocated ESOP shares (in shares)	(195,827)	(1,024,642)	(1,863,000)
Non-vested restricted stock (in shares)	(3,111,000)	(3,457,000)	(3,601,000)
Impact of weighted average shares (in shares)	2,356,000	(910,000)	(319,000)
Weighted average shares outstanding - basic (in shares)	52,111,000	51,672,000	50,830,000
Incremental shares from stock based compensation (in shares)	2,501,000	0	2,539,000
Weighted average shares outstanding - diluted (in shares)	54,612,000	51,672,000	53,369,000
Anti-dilutive restricted stock excluded from diluted EPS computation	0	2,294,000	0