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STOCK-BASED COMPENSATION - Restricted Shares and Restricted Stock Units Activity (Details) - Restricted Stock Units (in thousands)
shares in Thousands
 12 Months Ended
Sep. 30, 2025
$ / shares
shares
Restricted Shares or Stock Units  
Beginning balance (in shares) | shares 1,527
Granted (in shares) | shares 1,000
Vested (in shares) | shares (627)
Forfeited (in shares) | shares (19)
Ending balance (in shares) | shares 1,881
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance (in dollars per share) | $ / shares $ 7.10
Granted (in dollars per share) | $ / shares 2.80
Vested (in dollars per share) | $ / shares 9.57
Forfeited (in dollars per share) | $ / shares 2.41
Ending balance (in dollars per share) | $ / shares $ 4.04