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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Retirement Benefits [Abstract]      
Accumulated benefit obligation $ 54,646 $ 60,463  
Changes in projected benefit obligations:      
Projected benefit obligation at beginning of year 60,463 110,352  
Interest cost $ 3,086 $ 2,537 $ 2,925
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 gain $ (4,940) $ (16,260)  
Benefits paid (3,963) (36,166)  
Projected benefit obligation at end of year 54,646 60,463 110,352
Change in plan assets:      
Fair value of plan assets at beginning of year 41,764 87,255  
Actual return on plan assets 979 (14,324)  
Employer contribution 5,000 5,000  
Benefits paid (3,963) (36,167)  
Fair value of plan assets at end of year 43,780 41,764 $ 87,255
Funded status of the plan at end of year $ (10,866) $ (18,699)