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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)