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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Retirement Benefits [Abstract] |  |  |  |
Settlement expense | $ (1,548,000) | $ 0 | $ (1,548,000) | $ 0
Employer contribution |  |  | $ 0 |

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