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RELATED PARTY TRANSACTIONS (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 26, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019
Related Party Transaction [Line Items] |  |  |  |
Equity in net income of unconsolidated affiliates |  | $ 3,607,000 | $ 2,690,000 |
FFF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity in net income of unconsolidated affiliates |  | 3,605,000 | 2,621,000 |
AEIX | Administrative Fee Revenue |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from related parties |  |  |  | $ 700,000
AEIX | Cost Reimbursement |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from related party transactions |  | 1,300,000 | 1,200,000 |
Maximum annual incentive management fee |  | 500,000 |  |
Due from related parties |  | $ 700,000 |  |
Premier Supply Chain Improvement, Inc | FFF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership share of net income of FFF (as a percent) | 49.00% | 49.00% |  | 49.00%
Premier Supply Chain Improvement, Inc | Administrative Fee Revenue | FFF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity in net income of unconsolidated affiliates |  | $ 3,600,000 | 2,600,000 |
Revenues from related party transactions |  | $ 2,200,000 | $ 2,300,000 |

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