RETIREMENT PLANS - WEIGHTED AVERAGE BENEFIT OBLIGATIONS AND NET BENEFIT (INCOME) COST (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Pension Plan
Assumptions used to determine fiscal year-end benefit obligations:
Discount rate	5.16%	4.88%
Assumptions used to determine net benefit costs (years ended):
Discount rate	4.88%	5.62%
Expected return on plan assets	6.20%	6.50%
SERP
Assumptions used to determine fiscal year-end benefit obligations:
Discount rate	5.16%	4.88%
Assumptions used to determine net benefit costs (years ended):
Discount rate	4.88%	5.62%