EARNINGS PER SHARE - Basic and diluted EPS from continuing operations (Details) - shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Common shares outstanding (in shares)	57,064,000	56,613,000	56,130,000
Unallocated ESOP shares (in shares)	(1,024,642)	(1,863,181)	(2,058,000)
Non-vested restricted stock (in shares)	(3,457,000)	(3,601,000)	(3,556,000)
Impact of weighted average shares (in shares)	(910,000)	(319,000)	(7,928,000)
Weighted average shares outstanding - basic (in shares)	51,672,000	50,830,000	42,588,000
Incremental shares from stock based compensation (in shares)	0	2,539,000	2,427,000
Weighted average shares outstanding - diluted (in shares)	51,672,000	53,369,000	45,015,000
Anti-dilutive restricted stock excluded from diluted EPS computation	2,294,000	0	0