v3.24.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RELATED RISKS AND UNCERTAINTIES - Narrative (Details)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2022
USD ($)
shares
Jun. 30, 2024
USD ($)
geographical_area
executiveOfficer
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
executiveOfficer
shares
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]              
Restricted cash and cash equivalents   $ 78,400 $ 61,400 $ 78,400 $ 61,400 $ 59,100 $ 36,900
Additional cash and cash equivalents restricted at the election of management for potential insurance claims           58,400  
Convertible notes   $ 9,400   $ 9,400      
Convertible notes (in shares) | shares   0.5   0.5      
Number of executive officers serving on related party board | executiveOfficer   1   1      
Receivables   $ 415,395   $ 415,395   404,188  
Other assets, net   49,369   49,369   32,061  
Contract liability   24,326   24,326   28,882  
Drilling services   695,139 721,567 2,054,835 2,205,419    
Underwriting expense   5,300 5,500 10,400 10,200    
Casualty insurance premiums   9,500 9,700 28,500 30,600    
Premium revenues and expenses   14,700 17,400 45,700 51,400    
Stop-loss medical expenses   4,100 2,100 11,400 7,400    
Foreign currency losses   2,100 $ 1,400 4,500 $ 1,700    
Foreign Exchange              
Summary Of Significant Accounting Policies [Line Items]              
Foreign currency losses   $ 7,100   $ 7,100      
International Locations | Geographic Concentration Risk | Operating Revenue              
Summary Of Significant Accounting Policies [Line Items]              
Concentration percentage   7.00% 6.80% 7.40% 7.30%    
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   $ 9,200   $ 9,200      
South America | International Locations | Geographic Concentration Risk | Operating Revenue | International Solutions              
Summary Of Significant Accounting Policies [Line Items]              
Concentration percentage   77.90% 84.80% 77.10% 87.30%    
United States | Foreign Exchange              
Summary Of Significant Accounting Policies [Line Items]              
Proceeds received       $ 13,800      
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   $ 1,500   1,500   2,800  
Other assets, net           8,000  
Contract liability   4,500   4,500   6,600  
Drilling services   2,900   $ 9,900      
Expected revenue   $ 32,800          
Acquisition of Drilling Technologies Companies              
Summary Of Significant Accounting Policies [Line Items]              
Restricted cash and cash equivalents           $ 700