RETIREMENT PLANS - CHANGES IN BENEFIT OBLIGATIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 13,094
Fair value of plan assets at end of year	14,029	$ 13,094
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	5,928	4,899
Noncurrent liabilities	(1,791)	(1,898)
Pension Plan
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	8,195	7,511
Interest cost	390	411
Actuarial (gain) loss	(90)	520
Benefits paid	(394)	(247)
Benefit obligation at end of year	8,101	8,195
Change in Plan Assets:
Fair value of plan assets at beginning of year	13,094	11,982
Actual return on plan assets	1,329	1,359
Benefits paid	(394)	(247)
Fair value of plan assets at end of year	14,029	13,094
Funded status	5,928	4,899
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	5,928	4,899
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount	5,928	4,899
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial gain	(1,871)	(1,251)
Accumulated other comprehensive income	(1,871)	(1,251)
SERP
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	1,974	1,734
Interest cost	95	95
Actuarial (gain) loss	(5)	149
Benefits paid	(3)	(4)
Benefit obligation at end of year	2,061	1,974
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	(2,061)	(1,974)
Amounts recognized in the Consolidated Balance Sheets:
Noncurrent assets	0	0
Current liabilities	(270)	(76)
Noncurrent liabilities	(1,791)	(1,898)
Net amount	(2,061)	(1,974)
Amounts recognized in accumulated other comprehensive income before income taxes:
Net actuarial gain	(100)	(96)
Accumulated other comprehensive income	$ (100)	$ (96)