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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Retirement Benefits [Abstract]      
Accumulated benefit obligation $ 60,463 $ 110,352  
Changes in projected benefit obligations:      
Projected benefit obligation at beginning of year 110,352 116,146  
Interest cost 2,537 2,925 $ 3,598
Actuarial (gain) loss (16,260) 7,111  
Benefits paid (36,166) (15,749)  
Other 0 (81)  
Projected benefit obligation at end of year $ 60,463 110,352 116,146
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative    
Change in plan assets:      
Fair value of plan assets at beginning of year $ 87,255 86,103  
Actual return on plan assets (14,324) 11,835  
Employer contribution 5,000 5,066  
Benefits paid (36,167) (15,749)  
Fair value of plan assets at end of year 41,764 87,255 $ 86,103
Funded status of the plan at end of year $ (18,699) $ (23,097)