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EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Pension Benefit Obligations and Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Retirement Benefits [Abstract] |  |  |
Accumulated Benefit Obligation | $ 116,146 | $ 119,845 |
Changes in projected benefit obligations |  |  |
Projected benefit obligation at beginning of year | 119,845 | 106,205 |
Interest cost | 3,598 | 4,389 | $ 4,077
Actuarial (gain) loss | 4,310 | 16,914 |
Benefits paid | (11,607) | (7,663) |
Projected benefit obligation at end of year | 116,146 | 119,845 | 106,205
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 91,142 | 94,897 |
Actual return on plan assets | 6,535 | 3,865 |
Employer contribution | 33 | 43 |
Benefits paid | (11,607) | (7,663) |
Fair value of plan assets at end of year | 86,103 | 91,142 | $ 94,897
Funded status of the plan at end of year | $ (30,043) | $ (28,703) |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -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 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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