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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details)
$ in Thousands, shares in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2022
USD ($)
shares
Sep. 30, 2024
USD ($)
geographical_area
executive_officer
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Foreign currency losses   $ 5,500 $ 6,400 $ 5,900
Restricted cash and cash equivalents   1,300,000 59,100  
Additional cash and cash equivalents restricted at the election of management for potential insurance claims   68,900 58,400  
Inventory valuation reserves   19,500 22,400  
Restricted cash - long-term:   1,242,417 0  
Convertible notes   $ 9,400    
Convertible notes (in shares) | shares   0.5    
Number of executive officers serving on related party board | executive_officer   1    
Receivables   $ 418,604 404,188  
Other assets, net   63,692 32,061  
Contract liability   29,052 28,882 20,646
Drilling services   2,746,128 2,862,677 2,049,841
Early termination revenue   13,400 2,300 700
Revenue   2,756,607 2,872,421 2,058,944
Underwriting expenses   11,400 12,500 7,000
Casualty insurance premiums   37,600 39,700 35,600
Premium revenues and expenses   61,200 67,400 57,000
Stop-loss medical expenses   $ 15,500 10,600 11,800
Cumulative inflation rate before a country is considered highly inflationary   100.00%    
Restricted Cash        
Summary Of Significant Accounting Policies [Line Items]        
Restricted cash - long-term:   $ 1,242,417 0 0
International Solutions Segment        
Summary Of Significant Accounting Policies [Line Items]        
Revenue   193,975 $ 212,566 136,072
Customer Concentration Risk | Largest Drilling Customer        
Summary Of Significant Accounting Policies [Line Items]        
Revenue   $ 302,600    
Operating Revenues | Geographic Concentration Risk | International Locations        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage   7.20% 7.50%  
Operating Revenues | Customer Concentration Risk | Largest Drilling Customer        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage   11.00%    
United States        
Summary Of Significant Accounting Policies [Line Items]        
Revenue   $ 2,558,814 $ 2,656,617 1,920,026
South America | Segment Revenue | Geographic Concentration Risk | International Locations | International Solutions Segment        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage   76.70% 85.30%  
Foreign Exchange        
Summary Of Significant Accounting Policies [Line Items]        
Foreign currency losses   $ (7,100) $ (12,200)  
Foreign Exchange | United States        
Summary Of Significant Accounting Policies [Line Items]        
Proceeds received   13,800 9,800  
Reimbursements Received for Out-of-Pocket Expenses        
Summary Of Significant Accounting Policies [Line Items]        
Drilling services   $ 334,600 345,500 $ 263,100
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life of finite-lived intangible assets used for amortization   5 years    
Lease term, lessee   1 year    
Deductible per occurrence   $ 1,000    
Number of geographical areas operating | geographical_area   1    
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life of finite-lived intangible assets used for amortization   20 years    
Lease term, lessee   15 years    
Deductible per occurrence   $ 10,000    
Investee        
Summary Of Significant Accounting Policies [Line Items]        
Receivables   5,000 2,800  
Other assets, net     8,000  
Contract liability   3,900 6,600  
Drilling services   14,100 $ 3,400  
Expected revenue   30,000    
Investment in Tamboran        
Summary Of Significant Accounting Policies [Line Items]        
Payments to acquire investments $ 14,100      
Investment shares acquired (in shares) | shares 106.0      
KCA Deutag Acquisition        
Summary Of Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 1,200,000