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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
geographical_area
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Summary of Significant Accounting Policies [Line Items]              
Restricted cash $ 33,900,000   $ 51,300,000 $ 33,900,000 $ 51,300,000 $ 19,200,000 $ 48,900,000
Additional cash restricted at the election of management for potential insurance claims 32,800,000     32,800,000   17,700,000  
Increase (decrease) in cash and cash equivalents and restricted cash Label Role       (714,127,000) (114,875,000)    
Payment for extinguishment of long-term debt       487,148,000 0    
Adjustments to casualty insurance accruals 3,100,000   6,000,000 2,700,000 8,800,000    
Casualty insurance expense 9,400,000   5,600,000 26,200,000 13,100,000    
Premium revenues and expenses       41,600,000 25,200,000    
Stop-loss program, maximum amount of claim       50,000      
Stop-loss medical expenses 3,800,000   3,200,000 $ 10,600,000 8,700,000    
Cumulative inflation rate before a country is considered highly inflationary (as a percent)       100.00%      
Foreign currency loss $ 1,200,000   $ 700,000 $ 4,500,000 $ 4,900,000    
Operating Revenue | Geographic Concentration Risk | International Locations              
Summary of Significant Accounting Policies [Line Items]              
Concentration percentage (as a percent) 5.40%   4.80% 6.70% 4.80%    
Minimum              
Summary of Significant Accounting Policies [Line Items]              
Number of geographical areas operating in (more than) | geographical_area       1      
Argentina              
Summary of Significant Accounting Policies [Line Items]              
Cash $ 3,800,000     $ 3,800,000      
South America | Operating Revenue | Geographic Concentration Risk | International Locations | International Solutions              
Summary of Significant Accounting Policies [Line Items]              
Concentration percentage (as a percent) 82.60%   52.20% 78.40% 43.10%    
Intercompany Eliminations              
Summary of Significant Accounting Policies [Line Items]              
Premium revenues and expenses $ 14,700,000   $ 9,400,000        
Unsecured Senior Notes Issued 2025              
Summary of Significant Accounting Policies [Line Items]              
Payment for extinguishment of long-term debt       $ 487,100,000      
Make-whole premium and accrued interest   $ 56,400,000          
Acquisition of Drilling Technology Companies              
Summary of Significant Accounting Policies [Line Items]              
Restricted cash $ 1,100,000     $ 1,100,000   $ 1,500,000