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BUSINESS COMBINATION - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 16, 2025
Sep. 30, 2025
Sep. 30, 2024
Noncurrent liabilities assumed:      
Goodwill   $ 182,854 $ 45,653
KCA Deutag      
Business Combination [Line Items]      
Consideration given $ 2,035,523 $ 2,000,000  
Allocation of purchase price      
Cash and cash equivalents 199,447    
Short-term investments 33    
Accounts receivable, net 316,207    
Inventories of materials and supplies, net 183,527    
Prepaid expenses and other, net 87,998    
Investments, net 1,146    
Property, plant and equipment, net 1,459,490    
Intangible assets, net 468,809    
Operating lease right-of-use assets 46,162    
Total assets acquired 2,762,819    
Current liabilities assumed:      
Accounts payable and accrued liabilities 479,976    
Current portion of long-term debt, net 6,755    
Noncurrent liabilities assumed:      
Deferred income 6,163    
Long-term debt, net 78,188    
Deferred income taxes 202,050    
Retirement benefit obligations 99,043    
Other 52,999    
Total liabilities assumed 925,174    
Net assets acquired 1,837,645    
Add: Fair value of non-controlling interests acquired 116,061    
Goodwill 313,939    
Contractual amount gross 329,300    
Uncollectible accounts receivable $ 13,100