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EMPLOYEE BENEFIT PLANS - Summary of Changes in the Fair Value of the Pension Plan's Level 3 Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 91,142 | $ 94,897
Fair value of plan assets at end of year | 86,103 | 91,142
Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 161 | 116
Unrealized gains (losses) relating to property still held at the reporting date | (78) | 45
Fair value of plan assets at end of year | $ 83 | $ 161

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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)(02)(A) -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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