STOCK-BASED COMPENSATION - DEFERRED RETENTION STOCK/NON-EMPLOYEE DIRECTOR STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Scheduled to Vest Immediately | Director
Shares
Granted (in shares)	30,908	34,994	27,696
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 39.09	$ 35.72	$ 42.88
Total Fair Value of Vested Shares
Compensation costs not yet recognized	$ 300
Deferred retention stock
Shares
Outstanding at beginning of period (in shares)	208,856	228,246	243,561
Granted/Vested (in shares)	192,728	2,999	42,358
Delivered (in shares)	(163,499)	(22,389)	(57,673)
Forfeited (in shares)	(6,818)
Outstanding at end of period (in shares)	231,267	208,856	228,246
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 46.28	$ 46.32	$ 44.67
Granted (in dollars per share)	38.95	33.34	40.72
Vested (in dollars per share)	38.95	33.34	40.72
Delivered (in dollars per share)	47.95	45.00	35.25
Forfeited (in dollars per share)	40.33
Outstanding at end of period (in dollars per share)	$ 39.16	$ 46.28	$ 46.32
Total Fair Value of Vested Shares
Delivered	$ 6,167	$ 641	$ 2,423