RETIREMENT PLANS - CHANGES IN BENEFIT OBLIGATIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 11,982
Fair value of plan assets at end of year	13,094	$ 11,982
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	4,899	4,471
Noncurrent liabilities	(1,898)	(1,664)
Pension Plan
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	7,511	7,931
Interest cost	411	406
Actuarial loss (gain)	520	(394)
Benefits paid	(247)	(432)
Benefit obligation at end of year	8,195	7,511
Change in Plan Assets:
Fair value of plan assets at beginning of year	11,982	11,316
Actual return on plan assets	1,359	1,098
Benefits paid	(247)	(432)
Fair value of plan assets at end of year	13,094	11,982
Funded status	4,899	4,471
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	4,899	4,471
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount	4,899	4,471
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial gain	(1,251)	(1,178)
Accumulated other comprehensive income	(1,251)	(1,178)
SERP
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	1,734	1,715
Interest cost	95	88
Actuarial loss (gain)	149	(66)
Benefits paid	(4)	(3)
Benefit obligation at end of year	1,974	1,734
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	(1,974)	(1,734)
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	0	0
Current liabilities	(76)	(70)
Noncurrent liabilities	(1,898)	(1,664)
Net amount	(1,974)	(1,734)
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial gain	(96)	(330)
Accumulated other comprehensive income	$ (96)	$ (330)