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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 3 Months Ended 9 Months Ended
Jan. 16, 2025
Oct. 31, 2022
USD ($)
shares
Jun. 30, 2025
USD ($)
executive_officer
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
executive_officer
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
Mar. 31, 2025
Sep. 30, 2024
USD ($)
Summary Of Significant Accounting Policies [Line Items]                
Restricted cash     $ 61,100   $ 61,100     $ 1,300,000
Additional cash and cash equivalents restricted at the election of management for potential insurance claims     59,400   59,400     68,900
Convertible notes     $ 9,400   $ 9,400      
Convertible notes (in shares) | shares     0.5   0.5      
Number of executive officers serving on related party board | executive_officer     1   1      
Receivables     $ 782,625   $ 782,625     418,604
Contract liability     53,089   53,089     $ 29,052
Drilling services     1,037,876 $ 695,139 2,724,883 $ 2,054,835    
Net income     $ (162,758) $ 88,685 $ (106,332) $ 268,689    
Basic (in dollars per share) | $ / shares     $ (1.64) $ 0.89 $ (1.08) $ 2.68    
Diluted (in dollars per share) | $ / shares     $ (1.64) $ 0.88 $ (1.08) $ 2.67    
Underwriting expense     $ 29,300 $ 5,300 $ 43,500 $ 10,400    
Casualty insurance premiums     10,100 9,500 31,800 28,500    
Premium revenues and expenses     16,300 14,700 50,800 45,700    
Stop-loss medical expenses     $ 4,400 $ 4,100 $ 14,800 $ 11,400    
International Locations | Geographic Concentration Risk | Operating Revenue                
Summary Of Significant Accounting Policies [Line Items]                
Concentration percentage     36.70% 7.00% 31.40% 7.40%    
Middle East | International Locations | Geographic Concentration Risk | Operating Revenue                
Summary Of Significant Accounting Policies [Line Items]                
Concentration percentage     16.10% 1.00% 13.20% 1.10%    
Saudi Arabia | International Locations | Geographic Concentration Risk | Operating Revenue                
Summary Of Significant Accounting Policies [Line Items]                
Concentration percentage     10.00%   7.40%      
Intangible Assets, Amortization Period                
Summary Of Significant Accounting Policies [Line Items]                
Amortization     $ 7,800   $ 7,800      
Net income     $ (6,200)   $ (6,200)      
Basic (in dollars per share) | $ / shares     $ (0.06)   $ (0.06)      
Diluted (in dollars per share) | $ / shares     $ (0.06)   $ (0.06)      
Customer relationships                
Summary Of Significant Accounting Policies [Line Items]                
Weighted average useful life     9 years   9 years   15 years 9 years
Investee                
Summary Of Significant Accounting Policies [Line Items]                
Receivables     $ 900   $ 900     $ 5,000
Contract liability     4,300   4,300     3,900
Drilling services     $ 3,100 $ 2,900 11,300 $ 9,900    
Expected revenue         $ 30,700      
Tamboran Resources Limited                
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               $ 1,200,000
KCA Deutag                
Summary Of Significant Accounting Policies [Line Items]                
Operating period 166 days       273 days      
KCA Deutag | Customer relationships                
Summary Of Significant Accounting Policies [Line Items]                
Weighted average useful life 9 years   2 years 8 months 12 days   2 years 8 months 12 days