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RECEIVABLES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Receivables [Line Items] |  |  |  |
Allowance for uncollectible receivables | $ 6.7 | $ 5.3 | $ 3.5 | $ 3.0
Aggregate gross amount factored, trade receivable | 1,328.7 | 1,206.5 | 1,222.3 |
Factoring costs | $ 3.5 | $ 4.8 | $ 7.4 |
One Customer | Trade Receivable | Customer Concentration Risk |  |  |  |
Receivables [Line Items] |  |  |  |
Concentration risk | 14.70% |  |  |
Two Customers | Trade Receivable | Customer Concentration Risk |  |  |  |
Receivables [Line Items] |  |  |  |
Concentration risk |  | 33.20% |  |

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