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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, 2021
Sep. 30, 2020
Sep. 30, 2019
Retirement Benefits [Abstract]      
Accumulated benefit obligation $ 110,352 $ 116,146  
Changes in projected benefit obligations:      
Projected benefit obligation at beginning of year 116,146 119,845  
Interest cost 2,925 3,598 $ 4,389
Actuarial loss 7,111 4,310  
Benefits paid (15,749) (11,607)  
Other (81) 0  
Projected benefit obligation at end of year 110,352 116,146 119,845
Change in plan assets:      
Fair value of plan assets at beginning of year 86,103 91,142  
Actual return on plan assets 11,835 6,535  
Employer contribution 5,066 33  
Benefits paid (15,749) (11,607)  
Fair value of plan assets at end of year 87,255 86,103 $ 91,142
Funded status of the plan at end of year $ (23,097) $ (30,043)