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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 12 Months Ended
Jan. 16, 2025
Oct. 31, 2022
USD ($)
shares
Sep. 30, 2025
USD ($)
geographical_area
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
Summary Of Significant Accounting Policies [Line Items]          
Restricted cash     $ 29,100 $ 1,300,000  
Additional cash and cash equivalents restricted at the election of management for potential insurance claims     27,400 68,900  
Inventory valuation reserves     93,500 19,500  
Depository beneficial interests   0.50%      
Convertible notes     $ 9,400    
Convertible notes (in shares) | shares     0.5    
Receivables     $ 782,644 418,604  
Contract liability     81,213 29,052 $ 28,882
Drilling services     3,678,660 2,746,128 2,862,677
Early termination revenue     2,300 13,400 2,300
Net income     $ (163,695) $ 344,165 $ 434,100
Basic (in dollars per share) | $ / shares     $ (1.66) $ 3.43 $ 4.18
Diluted (in dollars per share) | $ / shares     $ (1.66) $ 3.43 $ 4.16
Underwriting expenses     $ 39,900 $ 11,400 $ 12,500
Casualty insurance premiums     42,700 37,600 39,700
Premium revenues and expenses     69,200 61,200 67,400
Stop-loss medical expenses     20,700 15,500 10,600
Operating revenues     $ 3,746,013 2,756,607 2,872,421
Number of geographical areas operating | geographical_area     1    
Investee          
Summary Of Significant Accounting Policies [Line Items]          
Receivables     $ 700 5,000  
Contract liability     3,900 3,900  
Drilling services     16,100 $ 14,100  
Expected revenue     26,300    
Investment in Tamboran          
Summary Of Significant Accounting Policies [Line Items]          
Payments to acquire investments   $ 14,100      
Investment shares acquired (in shares) | shares   106.0      
Intangible Assets, Amortization Period          
Summary Of Significant Accounting Policies [Line Items]          
Amortization     15,600    
Net income     $ (12,400)    
Basic (in dollars per share) | $ / shares     $ (0.12)    
Diluted (in dollars per share) | $ / shares     $ (0.12)    
Customer relationships          
Summary Of Significant Accounting Policies [Line Items]          
Weighted average useful life     9 years 15 years  
Saudi Arabia          
Summary Of Significant Accounting Policies [Line Items]          
Operating revenues     $ 261,747 $ 0 0
Operating Revenues | Geographic Concentration Risk | International Locations          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage     33.80% 7.20%  
Concentration percentage       27.00%  
Operating Revenues | Geographic Concentration Risk | International Locations | Middle East          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage     13.90%    
Largest Drilling Customer | Customer Concentration Risk          
Summary Of Significant Accounting Policies [Line Items]          
Operating revenues     $ 451,300 $ 302,600  
Largest Drilling Customer | Operating Revenues | Customer Concentration Risk          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage     12.00% 11.00%  
Reimbursements Received for Out-of-Pocket Expenses          
Summary Of Significant Accounting Policies [Line Items]          
Drilling services     $ 431,200 $ 334,600 $ 345,500
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Weighted average useful life     1 year    
Lease term, lessee     1 year    
Deductible per occurrence     $ 1,000    
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Weighted average useful life     16 years    
Lease term, lessee     15 years    
Deductible per occurrence     $ 10,000    
KCA Deutag Acquisition          
Summary Of Significant Accounting Policies [Line Items]          
Restricted cash       $ 1,200,000  
KCA Deutag Acquisition | Operating Revenues | Geographic Concentration Risk | International Locations | Middle East          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage       1.00%  
KCA Deutag Acquisition | Operating Revenues | Geographic Concentration Risk | International Locations | Saudi Arabia          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage     7.00%    
KCA Deutag          
Summary Of Significant Accounting Policies [Line Items]          
Inventory valuation reserves     $ 74,700    
Operating period 258 days   365 days    
KCA Deutag | Customer relationships          
Summary Of Significant Accounting Policies [Line Items]          
Weighted average useful life     2 years