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PENSION AND OTHER POSTRETIREMENT PLANS - Fair Value Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | $ 208,344
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 92,900
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 101,133
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 14,311
Equity securities - stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 4,075
Equity securities - stocks | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 4,075
Equity securities - stocks | Level 1 | Class A common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 4,075 |
Equity securities - stocks | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Equity securities - stocks | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 111,536
Fixed income securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 10,403
Fixed income securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 101,133
Fixed income securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 78,422
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 78,422
Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Cash and cash equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 14,311
Other investments | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Other investments | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Other investments | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | $ 14,311

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