RETIREMENT PLANS - CHANGES IN BENEFIT OBLIGATIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 12,594
Fair value of plan assets at end of year	11,316	$ 12,594
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	3,385	2,229
Noncurrent liabilities	(1,649)	(2,101)
Pension Plan
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	10,365	10,280
Interest cost	290	258
Actuarial (gain) loss	(2,418)	(15)
Benefits paid	(306)	(158)
Termination of post-retirement medical plan	0	0
Benefit obligation at end of year	7,931	10,365
Change in Plan Assets:
Fair value of plan assets at beginning of year	12,594	11,051
Actual return on plan assets	(972)	1,701
Employer contributions	0	0
Benefits paid	(306)	(158)
Fair value of plan assets at end of year	11,316	12,594
Funded status	3,385	2,229
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	3,385	2,229
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount	3,385	2,229
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial (gain) loss	(353)	471
Accumulated other comprehensive (income) loss	(353)	471
SERP
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	2,136	2,031
Interest cost	60	51
Actuarial (gain) loss	(478)	63
Benefits paid	(3)	(9)
Termination of post-retirement medical plan	0	0
Benefit obligation at end of year	1,715	2,136
Change in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	0	0
Benefits paid	0	0
Fair value of plan assets at end of year	0	0
Funded status	(1,715)	(2,136)
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	0	0
Current liabilities	(66)	(35)
Noncurrent liabilities	(1,649)	(2,101)
Net amount	(1,715)	(2,136)
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial (gain) loss	(343)	135
Accumulated other comprehensive (income) loss	(343)	135
Post-retirement Medical
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	0	2,839
Interest cost	0	48
Actuarial (gain) loss	0	0
Benefits paid	0	(5)
Termination of post-retirement medical plan	0	(2,882)
Benefit obligation at end of year	0	0
Change in Plan Assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	0	5
Benefits paid	0	(5)
Fair value of plan assets at end of year	0	0
Funded status	0	0
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	0	0
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount	0	0
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial (gain) loss	0	0
Accumulated other comprehensive (income) loss	$ 0	$ 0