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PENSION AND OTHER POSTRETIREMENT PLANS - Fair Value Allocation of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 168,134 | $ 155,313
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 132,775 | 125,485
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 20,086 | 18,968
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 15,273 | 10,860
Equity securities - stocks |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 37,089 | 54,985
Equity securities - stocks | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 37,089 | 54,985
Equity securities - stocks | Level 1 | Class A common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 14,936 |
Equity securities - stocks | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Equity securities - stocks | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Equity securities - mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 81,588 | 50,312
Equity securities - mutual funds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 81,588 | 50,312
Equity securities - mutual funds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Equity securities - mutual funds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,824 | 34,797
Fixed income securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11,738 | 15,829
Fixed income securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 20,086 | 18,968
Fixed income securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,360 | 4,359
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,360 | 4,359
Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Cash and cash equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 15,273 | 10,860
Other investments | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Other investments | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Other investments | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 15,273 | $ 10,860

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