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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 |

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