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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
STOCK-BASED COMPENSATION |  |
Stock-based compensation, before income taxes | $ 7,844 | $ 28,974
Provision for income taxes | (311) | (5,123)
Stock-based compensation, net of income taxes | 7,533 | 23,851
General and administrative |  |
STOCK-BASED COMPENSATION |  |
Stock-based compensation, before income taxes | 7,844 | 5,960
Other operating expense |  |
STOCK-BASED COMPENSATION |  |
Stock-based compensation, before income taxes | $ 0 | $ 23,014

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