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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details)
 3 Months Ended
Dec. 31, 2021
USD ($)
geographical_area
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 29, 2021
USD ($)
Sep. 27, 2021
Sep. 30, 2020
USD ($)
Dec. 20, 2018
USD ($)
Nov. 13, 2018
USD ($)
Summary of Significant Accounting Policies [Line Items]                
Cash, cash equivalents, and short-term investments $ 441,300,000              
Restricted cash 18,500,000 $ 48,700,000 $ 19,200,000     $ 48,900,000    
Additional cash restricted at the election of management for potential insurance claims 17,400,000   17,700,000          
Increase (decrease) in cash and cash equivalents and restricted cash Label Role (684,057,000) (114,094,000)            
Payment for extinguishment of long-term debt 487,148,000 0            
Adjustments to casualty insurance accruals (2,200,000) 500,000            
Casualty insurance expense 8,800,000 2,500,000            
Stop-loss program, maximum amount of claim 50,000              
Stop-loss medical expenses $ 3,200,000 2,300,000            
Cumulative inflation rate before a country is considered highly inflationary (as a percent) 100.00%              
Aggregate foreign currency gain (loss) $ (1,000,000) $ (1,800,000)            
Operating Revenue | Geographic Concentration Risk | International Locations                
Summary of Significant Accounting Policies [Line Items]                
Concentration percentage 9.30% 4.40%            
Argentina                
Summary of Significant Accounting Policies [Line Items]                
Cash $ 39,600,000              
South America | Operating Revenue | Geographic Concentration Risk | International Locations | International Solutions                
Summary of Significant Accounting Policies [Line Items]                
Concentration percentage 77.10% 18.10%            
Intercompany Eliminations                
Summary of Significant Accounting Policies [Line Items]                
Premium revenues and expenses $ 13,600,000 $ 7,100,000            
Acquisition of Drilling Technology Companies                
Summary of Significant Accounting Policies [Line Items]                
Restricted cash $ 1,100,000   $ 1,500,000          
Minimum                
Summary of Significant Accounting Policies [Line Items]                
Number of geographical areas operating in (more than) | geographical_area 1              
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 | Letters of Credit                
Summary of Significant Accounting Policies [Line Items]                
Maximum borrowing capacity               $ 75,000,000
Unsecured Senior Notes Issued 2025                
Summary of Significant Accounting Policies [Line Items]                
Interest rate         4.65%      
Face amount of debt             $ 487,100,000  
Loss on extinguishment of debt 3,700,000              
Make-whole premium and accrued interest $ 56,400,000              
Unsecured Senior Notes Issued 2031                
Summary of Significant Accounting Policies [Line Items]                
Interest rate       2.90%        
Face amount of debt       $ 550,000,000