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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 29, 2021
Sep. 27, 2021
Apr. 16, 2021
Oct. 01, 2020
Dec. 20, 2018
Nov. 13, 2018
Summary Of Significant Accounting Policies [Line Items]                    
Cash, cash equivalents, and short-term investments   $ 1,100,000,000                
Foreign currency losses   5,300,000 $ 8,800,000 $ 8,200,000            
Restricted cash and cash equivalents   19,200,000 48,900,000              
Restricted cash and cash equivalents from initial capitalization of captive insurance company   2,000,000 2,000,000              
Additional cash and cash equivalents restricted at the election of management for potential insurance claims   17,700,000 43,100,000              
Reserves for excess and obsolete inventory   29,300,000 36,500,000              
Capitalized interest   0 0 0            
Drilling services   1,210,800,000 1,761,714,000 2,785,557,000            
Early termination revenue   7,700,000 73,400,000 11,300,000            
Retained earnings   2,573,375,000 3,010,012,000              
Underwriting expenses   12,600,000 16,400,000              
Casualty insurance premiums   21,900,000 6,700,000              
Premium revenues and expenses   35,400,000 36,900,000              
Stop-loss program, maximum amount of claim   50,000                
Stop-loss medical expenses   $ 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               $ (1,300,000)    
Operating Revenues | Geographic Concentration Risk | International Locations                    
Summary Of Significant Accounting Policies [Line Items]                    
Concentration percentage   5.00% 8.30%              
Segment Revenue | International Solutions | Geographic Concentration Risk | International Locations | South America                    
Summary Of Significant Accounting Policies [Line Items]                    
Concentration percentage   48.90% 61.60%              
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   148,000,000 $ 212,000,000 $ 322,800,000            
Acquisition of Drilling Technologies Companies                    
Summary Of Significant Accounting Policies [Line Items]                    
Restricted cash and cash equivalents   1,500,000 $ 3,600,000              
2018 Credit Facility                    
Summary Of Significant Accounting Policies [Line Items]                    
Maximum borrowing capacity                   $ 750,000,000
Borrowings outstanding   0                
Available borrowing capacity   $ 750,000,000                
2018 Credit Facility, Due November 2025                    
Summary Of Significant Accounting Policies [Line Items]                    
Maximum borrowing capacity             $ 680,000,000      
Unsecured Senior Notes due March 19, 2025                    
Summary Of Significant Accounting Policies [Line Items]                    
Interest rate           4.65%     4.65%  
Face amount of debt                 $ 487,100,000  
Unsecured Senior Notes due March 19, 2025 | Forecast                    
Summary Of Significant Accounting Policies [Line Items]                    
Make-whole premium and accrued interest $ 58,100,000                  
Write-off of unamortized discount and debt issuance costs $ 3,700,000                  
Unsecured Senior Notes due September 29, 2031                    
Summary Of Significant Accounting Policies [Line Items]                    
Interest rate         2.90%          
Face amount of debt         $ 550,000,000          
Letters of Credit | 2018 Credit Facility                    
Summary Of Significant Accounting Policies [Line Items]                    
Maximum borrowing capacity                   $ 75,000,000