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PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution plan expense | $ 8,685,000 | $ 8,620,000 | $ 8,117,000
Change in Assumptions for Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Reduction in service and interest cost | 1,960,000 |  |
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | 224,265,000 | 238,307,000 |
Projected benefit obligation | 241,553,000 | $ 259,672,000 |
Required plan contribution | $ 0 |  |
Target allocation of plan assets (as a percent) | 100.00% |  |
Return on plan assets | 6.75% | 6.75% | 7.25%
Pension | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of plan assets (as a percent) | 50.00% |  |
Pension | Fixed income, cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of plan assets (as a percent) | 30.00% |  |
Other Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Return on plan assets | 0.00% | 0.00% | 0.00%
Per capita cost of health care benefits assumed for next fiscal year (as a percent) | 7.80% |  |
Ultimate health care cost trend rate (as a percent) | 4.00% |  |
Effect of one percentage point increase on accumulated postretirement benefit obligation | $ 705,000 |  |
Effect of one percentage point increase on service and interest cost components | 46,000 |  |
Effect of one percentage point decrease on accumulated postretirement benefit obligation | 622,000 |  |
Effect of one percentage point decrease on service and interest cost components | $ 40,000 |  |

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- Definition Defined Benefit Plans, Service and Interest Cost + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -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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