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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) - USD ($)
 12 Months Ended
Oct. 01, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Summary Of Significant Accounting Policies [Line Items]        
Foreign currency losses   $ 5,900,000 $ 5,300,000 $ 8,800,000
Restricted cash and cash equivalents   36,900,000 19,200,000  
Additional cash and cash equivalents restricted at the election of management for potential insurance claims   35,800,000 17,700,000  
Reserves for excess and obsolete inventory   28,000,000 29,300,000  
Drilling services   2,049,841,000 1,210,800,000 1,761,714,000
Early termination revenue   700,000 7,700,000 73,400,000
Retained earnings   (2,473,572,000) (2,573,375,000)  
Income tax expense (benefit)   (24,366,000) 103,721,000 140,106,000
Underwriting expenses   7,000,000 12,600,000 16,400,000
Casualty insurance premiums   35,600,000 21,900,000 6,700,000
Premium revenues and expenses   57,000,000 35,400,000 36,900,000
Stop-loss program, maximum amount of claim   50,000    
Stop-loss medical expenses   $ 11,800,000 $ 12,000,000 8,000,000
Cumulative inflation rate before a country is considered highly inflationary   100.00%    
Cumulative Effect, Period of Adoption, Adjustment        
Summary Of Significant Accounting Policies [Line Items]        
Accounts receivable, allowance for credit loss $ 1,600,000      
Retained earnings 1,600,000      
Income tax expense (benefit) $ 1,300,000      
International Locations | Geographic Concentration Risk | Operating Revenues        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage   6.70% 5.00%  
South America | International Locations | Geographic Concentration Risk | International Solutions | Segment Revenue        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage   81.60% 48.90%  
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life of finite-lived intangible assets used for amortization   5 years    
Lease term, lessor   3 years    
Lease term, lessee   1 year    
Deductible per occurrence   $ 1,000,000    
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life of finite-lived intangible assets used for amortization   20 years    
Lease term, lessor   10 years    
Lease term, lessee   15 years    
Deductible per occurrence   $ 10,000,000    
Reimbursements Received for Out-of-Pocket Expenses        
Summary Of Significant Accounting Policies [Line Items]        
Drilling services   263,100,000 $ 148,000,000 $ 212,000,000
Acquisition of Drilling Technologies Companies        
Summary Of Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 1,100,000 $ 1,500,000