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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 6 Months Ended
Oct. 31, 2022
USD ($)
shares
Mar. 31, 2024
USD ($)
geographical_area
executiveOfficer
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
executiveOfficer
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]              
Restricted cash and cash equivalents   $ 68,500 $ 53,200 $ 68,500 $ 53,200 $ 59,100 $ 36,900
Additional cash and cash equivalents restricted at the election of management for potential insurance claims           58,400  
Number of executive officers serving on related party board | executiveOfficer   1   1      
Receivables   $ 431,681   $ 431,681   404,188  
Other assets, net   45,054   45,054   32,061  
Contract liability   26,804   26,804   28,882  
Drilling services   685,131 766,682 1,359,696 1,483,852    
Underwriting expense   1,600 1,700 5,100 4,700    
Casualty insurance premiums   9,900 10,900 19,000 20,900    
Premium revenues and expenses   15,800 17,700 31,000 34,100    
Stop-loss medical expenses   3,200 2,500 $ 7,300 5,300    
Cumulative inflation rate before a country is considered highly inflationary       100.00%      
Foreign currency losses   $ 600 $ 100 $ 2,400 $ 300    
International Locations | Geographic Concentration Risk | Operating Revenue              
Summary Of Significant Accounting Policies [Line Items]              
Concentration percentage   6.90% 7.40% 7.50% 7.50%    
Minimum              
Summary Of Significant Accounting Policies [Line Items]              
Number of geographical areas operating | geographical_area   1          
Argentina              
Summary Of Significant Accounting Policies [Line Items]              
Cash   $ 13,000   $ 13,000      
South America | International Locations | Geographic Concentration Risk | Operating Revenue | International Solutions              
Summary Of Significant Accounting Policies [Line Items]              
Concentration percentage   74.60% 86.30% 76.70% 88.40%    
Tamboran Resources Limited              
Summary Of Significant Accounting Policies [Line Items]              
Payments to acquire investments $ 14,100            
Investment shares acquired (in shares) | shares 106.0            
Investee              
Summary Of Significant Accounting Policies [Line Items]              
Receivables   $ 2,700   $ 2,700   2,800  
Other assets, net   8,100   8,100   8,000  
Contract liability   5,100   5,100   6,600  
Drilling services   2,700   $ 7,000      
Expected revenue   $ 33,700          
Acquisition of Drilling Technologies Companies              
Summary Of Significant Accounting Policies [Line Items]              
Restricted cash and cash equivalents           $ 700