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PENSION AND OTHER POSTRETIREMENT PLANS - Net Periodic Pension and Other Postretirement Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (deductions), net | Other income (deductions), net | Other income (deductions), net
Non-cash charge (in excess of) | $ (24,242) | $ (35,706) | $ 0
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 163 | 392 | 7,919
Interest cost | 497 | 1,127 | 6,145
Expected return on plan assets | 0 | (1,040) | (10,809)
Prior service cost | 0 | (152) | (127)
Net actuarial loss | (64) | 469 | 9,769
Curtailment gain | 0 | 0 | (220)
Special termination benefits | 0 | 0 | 315
Prior-service cost write-off | 0 | 0 | 261
Non-cash charge (in excess of) | 1,271 | 30,856 | 0
Net benefit cost | 1,867 | 31,652 | 13,253
Other Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 76 | 165 | 201
Interest cost | 644 | 411 | 376
Expected return on plan assets | 0 | 0 | 0
Prior service cost | (364) | (364) | (364)
Net actuarial loss | (708) | 0 | 0
Curtailment gain | 0 | 0 | 0
Special termination benefits | 0 | 0 | 0
Prior-service cost write-off | 0 | 0 | 0
Non-cash charge (in excess of) | 0 | 0 | 0
Net benefit cost | $ (352) | $ 212 | $ 213

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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