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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2022
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
geographical_area
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Restricted cash and cash equivalents   $ 59,100 $ 59,100 $ 36,900  
Additional cash and cash equivalents restricted at the election of management for potential insurance claims   58,400 58,400 35,800  
Reserves for excess and obsolete inventory   22,400 22,400 28,000  
Receivables   404,188 404,188 458,713  
Other assets, net   32,061 32,061 20,926  
Contract liability   $ 28,882 28,882 20,646 $ 9,286
Drilling services     2,862,677 2,049,841 1,210,800
Early termination revenue     2,300 700 7,700
Underwriting expenses     12,500 7,000 12,600
Casualty insurance premiums     39,700 35,600 21,900
Premium revenues and expenses     67,400 57,000 35,400
Stop-loss medical expenses     $ 10,600 11,800 12,000
Cumulative inflation rate before a country is considered highly inflationary     100.00%    
Foreign currency losses     $ 6,400 $ 5,900 5,300
International Locations | Geographic Concentration Risk | Operating Revenues          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage     7.50% 6.70%  
Reimbursements Received for Out-of-Pocket Expenses          
Summary Of Significant Accounting Policies [Line Items]          
Drilling services     $ 345,500 $ 263,100 $ 148,000
South America | International Locations | Geographic Concentration Risk | International Solutions | Segment Revenue          
Summary Of Significant Accounting Policies [Line Items]          
Concentration percentage     85.30% 81.60%  
Foreign Exchange          
Summary Of Significant Accounting Policies [Line Items]          
Foreign currency losses     $ 12,200    
Foreign Exchange | United States          
Summary Of Significant Accounting Policies [Line Items]          
Proceeds received     $ 9,800    
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Estimated life of finite-lived intangible assets used for amortization   5 years 5 years    
Lease term, lessee   1 year 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 20 years    
Lease term, lessee   15 years 15 years    
Deductible per occurrence     $ 10,000    
Investee          
Summary Of Significant Accounting Policies [Line Items]          
Receivables   $ 2,800 2,800    
Other assets, net   8,000 8,000    
Contract liability   6,600 6,600    
Drilling services     3,400    
Expected revenue   37,000      
Tamboran Resources Limited          
Summary Of Significant Accounting Policies [Line Items]          
Payments to acquire investments $ 14,100        
Investment shares acquired (in shares) | shares 106.0        
Acquisition of Drilling Technologies Companies          
Summary Of Significant Accounting Policies [Line Items]          
Restricted cash and cash equivalents   $ 700 $ 700 $ 1,100