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STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 07, 2021 | Nov. 20, 2019
Class of Stock [Line Items] |  |  |  |
Stock repurchased during period (in shares) | 101,481 | 103,830 |  |
Stock repurchased during period, value | $ 2.9 | $ 3.2 |  |
Shares retired | 203,224 | 0 |  |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 6,000,000 | 7,500,000
Stock repurchased and retired during the period (in shares) | 2,833,755 | 3,669,597 |  |
Remaining number of shares authorized to be repurchased (in shares) | 7,315,876 |  |  |

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