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PENSION AND OTHER POSTRETIREMENT PLANS - Weighted Average Asset Allocation and Target Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
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Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 158,662 | $ 155,634 |
Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 158,662 | 155,634 | $ 151,864
Defined Benefit Plan, Assets, Target 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 | $ 92,745 | 77,245 |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 50.00% |  |
Fixed income, cash and cash equivalents | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 44,250 | 49,008 |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 30.00% |  |
Other investments | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 21,667 | $ 29,381 |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 20.00% |  |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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