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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, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Jan. 16, 2025
United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation | $ 50,127 | $ 57,154 |  |
Changes in projected benefit obligations: |  |  |  |
Projected benefit obligation at beginning of year | $ 57,154 | $ 54,646 |  |
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 loss (gain) | $ (3,404) | $ 2,885 |  |
Benefits paid | (6,207) | (3,386) |  |
Projected benefit obligation at end of year | 50,127 | 57,154 | $ 54,646 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 53,521 | 43,780 |  |
Actual return on plan assets | 1,236 | 7,127 |  |
Employer contribution | 0 | 6,000 | 5,000 |
Benefits paid | (6,207) | (3,386) |  |
Fair value of plan assets at end of year | 48,550 | 53,521 | $ 43,780 |
Funded status of the plan at end of year | (1,577) | (3,633) |  |
Foreign Plan |  |  |  |
Changes in projected benefit obligations: |  |  |  |
Projected benefit obligation at beginning of year | 0 |  |  |
Acquisition of KCA Deutag | 132,477 |  |  |
Service cost | 3,339 |  |  |
Interest cost | $ 5,549 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative |  |  |
Actuarial loss (gain) | $ (1,714) |  |  |
Benefits paid | (5,066) |  |  |
Projected benefit obligation at end of year | 134,585 | 0 |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |
Acquisition of KCA Deutag | 33,176 |  |  |
Actual return on plan assets | 1,260 |  |  |
Employer contribution | 1,342 |  |  |
Benefits paid | (583) |  |  |
Administration costs | (67) |  |  |
Fair value of plan assets at end of year | 35,128 | $ 0 |  |
Funded status of the plan at end of year | $ (99,457) |  |  | $ (99,300)

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