RETIREMENT PLANS - CHANGES IN BENEFIT OBLIGATIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 11,316
Fair value of plan assets at end of year	11,982	$ 11,316
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	4,471	3,385
Noncurrent liabilities	(1,664)	(1,649)
Pension Plan
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	7,931	10,365
Interest cost	406	290
Actuarial gain	(394)	(2,418)
Benefits paid	(432)	(306)
Benefit obligation at end of year	7,511	7,931
Change in Plan Assets:
Fair value of plan assets at beginning of year	11,316	12,594
Actual return on plan assets	1,098	(972)
Benefits paid	(432)	(306)
Fair value of plan assets at end of year	11,982	11,316
Funded status	4,471	3,385
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	4,471	3,385
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount	4,471	3,385
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial gain	(1,178)	(353)
Accumulated other comprehensive income	(1,178)	(353)
SERP
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	1,715	2,136
Interest cost	88	60
Actuarial gain	(66)	(478)
Benefits paid	(3)	(3)
Benefit obligation at end of year	1,734	1,715
Change in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Benefits paid	0	0
Fair value of plan assets at end of year	0	0
Funded status	(1,734)	(1,715)
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	0	0
Current liabilities	(70)	(66)
Noncurrent liabilities	(1,664)	(1,649)
Net amount	(1,734)	(1,715)
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial gain	(330)	(343)
Accumulated other comprehensive income	$ (330)	$ (343)