EMPLOYEE BENEFIT PLANS (Details) - Actual and weighted-average assets allocation for qualified benefit plans	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, total actual weighted average plan asset allocations	100.00%	100.00%
Target plan asset allocations	100.00%
Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, total actual weighted average plan asset allocations	0.40%	1.90%
Target plan asset allocations	0.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, total actual weighted average plan asset allocations	48.50%	49.90%
Target plan asset allocations	63.00%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, total actual weighted average plan asset allocations	31.90%	29.40%
Target plan asset allocations	37.00%
Other Asset Categories
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, total actual weighted average plan asset allocations	19.20%	18.80%
Target plan asset allocations	0.00%