PENSION AND OTHER POSTRETIREMENT PLANS - Weighted Average Asset Allocation and Target Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets		$ 208,344
Pension
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 0	208,344	$ 168,134
Equity securities | Pension
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets		4,075
Fixed income, cash and cash equivalents | Pension
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets		189,958
Other investments | Pension
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets		$ 14,311