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EMPLOYEE BENEFIT PLANS - Narrative (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
USD ($)
plan
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jan. 16, 2025
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Liability for net actuarial loss outstanding $ (109,864) $ (6,524)    
Percentage of employer's contribution under 401(k)/ thrift plan matching the first 5 percent of participant's compensation subject to certain limitations 100.00%      
Percentage of participant's compensation eligible for employer's matching contribution 5.00%      
Annual expense incurred for defined contribution plan $ 23,600 26,900 $ 25,800  
KCA Deutag        
Defined Benefit Plan Disclosure [Line Items]        
Annual expense incurred for defined contribution plan 10,000      
United States        
Defined Benefit Plan Disclosure [Line Items]        
Liability for net actuarial loss outstanding (1,600) (3,600)    
Accumulated other comprehensive income (loss) (4,700) (7,600)    
Employer contribution 0 6,000 5,000  
Net pension liability 1,577 3,633    
Benefit obligation 50,127 57,154 54,646  
Fair value of pension plan assets 48,550 53,521 $ 43,780  
Foreign Plan        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated other comprehensive income (loss) 8,100      
Employer contribution 1,342      
Net pension liability 99,457     $ 99,300
Benefit obligation 134,585 0   132,500
Fair value of pension plan assets 35,128 $ 0   $ 33,200
Plan assets 35,100      
Annual expense incurred for defined contribution plan $ 5,700      
Germany Plans        
Defined Benefit Plan Disclosure [Line Items]        
Number of pension plans | plan 4      
UK Plans        
Defined Benefit Plan Disclosure [Line Items]        
Number of pension plans | plan 2