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EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Pension Benefit Obligations and Fair Value of Pension Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Retirement Benefits [Abstract]      
Accumulated benefit obligation $ 57,154 $ 54,646  
Changes in projected benefit obligations:      
Projected benefit obligation at beginning of year 54,646 60,463  
Interest cost $ 3,009 $ 3,086 $ 2,537
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative Selling, general and administrative  
Actuarial loss (gain) $ 2,885 $ (4,940)  
Benefits paid (3,386) (3,963)  
Projected benefit obligation at end of year 57,154 54,646 60,463
Change in plan assets:      
Fair value of plan assets at beginning of year 43,780 41,764  
Actual return on plan assets 7,127 979  
Employer contribution 6,000 5,000 5,000
Benefits paid (3,386) (3,963)  
Fair value of plan assets at end of year 53,521 43,780 $ 41,764
Funded status of the plan at end of year $ (3,633) $ (10,866)