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EMPLOYEE BENEFIT PLANS - Schedule of Plan assets and benefit obligation of the defined benefit plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Change in benefit obligation:      
Benefit obligation at end of fiscal year $ 6,527    
Change in plan assets:      
Fair value of plan assets at beginning of fiscal year 158,705    
Fair value of plan assets at end of fiscal year 132,376 $ 158,705  
Amounts recognized in the statement of financial position consist of:      
Non-Current Assets 1,016    
Pension Plan      
Change in benefit obligation:      
Benefit obligation at beginning of fiscal year 145,746 139,224  
Interest cost 5,506 7,050 $ 6,814
Benefits paid (11,124) (11,576)  
Benefits paid related to pension termination (15,784) 0  
Actuarial (gain) loss (2,823) 11,048  
Benefit obligation at end of fiscal year 121,521 145,746 139,224
Change in plan assets:      
Fair value of plan assets at beginning of fiscal year 158,705 146,997  
Actual return on plan assets 6,048 21,933  
Company contributions 631 1,351  
Benefits paid (11,124) (11,576)  
Benefits paid related to pension termination (15,784) 0  
Return of excess plan assets (6,100) 0  
Fair value of plan assets at end of fiscal year 132,376 158,705 146,997
Projected benefit obligation in excess of plan assets 10,855 12,959  
Amounts recognized in the statement of financial position consist of:      
Non-Current Assets 10,855 12,959  
Accrued liabilities 0 0  
Other liabilities (long-term) 0 0  
Total Liabilities 10,855 12,959  
Net actuarial losses 28,367 25,314  
Deferred taxes (5,957) (5,316)  
Total accumulated other comprehensive loss, net of tax 22,410 19,998  
Net amount recognized at September 30, 33,265 32,957  
Accumulated benefit obligations 121,521 145,746  
Information for plans with accumulated benefit obligations in excess of plan assets:      
ABO 121,521 145,746  
PBO 121,521 145,746  
Fair value of plan assets 132,376 158,705  
Supplemental Employee Retirement Plan      
Change in benefit obligation:      
Benefit obligation at beginning of fiscal year 10,776 10,882  
Interest cost 387 504 488
Benefits paid (1,893) (1,896)  
Benefits paid related to pension termination 0 0  
Actuarial (gain) loss 870 1,286  
Benefit obligation at end of fiscal year 10,140 10,776 10,882
Change in plan assets:      
Fair value of plan assets at beginning of fiscal year 0 0  
Actual return on plan assets 0 0  
Company contributions 1,893 1,896  
Benefits paid (1,893) (1,896)  
Benefits paid related to pension termination 0 0  
Return of excess plan assets 0  
Fair value of plan assets at end of fiscal year 0 0 $ 0
Projected benefit obligation in excess of plan assets (10,140) (10,776)  
Amounts recognized in the statement of financial position consist of:      
Non-Current Assets 0 0  
Accrued liabilities (1,813) (1,823)  
Other liabilities (long-term) (8,327) (8,953)  
Total Liabilities (10,140) (10,776)  
Net actuarial losses 6,953 6,700  
Deferred taxes (1,665) (3,037)  
Total accumulated other comprehensive loss, net of tax 5,288 3,663  
Net amount recognized at September 30, (4,852) (7,113)  
Accumulated benefit obligations 10,140 10,776  
Information for plans with accumulated benefit obligations in excess of plan assets:      
ABO 10,140 10,776  
PBO 10,140 10,776  
Fair value of plan assets $ 0 $ 0