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PENSION AND OTHER POSTRETIREMENT PLANS - Weighted Average Asset Allocation and Target Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 155,313 | $ 158,662 |
Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 155,313 | 158,662 | $ 155,634
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 100.00% |  |
Equity securities | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 105,297 | 92,745 |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 65.00% |  |
Fixed income, cash and cash equivalents | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 39,156 | 44,250 |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 25.00% |  |
Other investments | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 10,860 | $ 21,667 |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 10.00% |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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