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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RELATED RISKS AND UNCERTAINTIES - Narrative (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
geographical_area
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Restricted cash and cash equivalents $ 53,200,000 $ 27,200,000 $ 53,200,000 $ 27,200,000 $ 36,900,000 $ 19,200,000
Additional cash and cash equivalents restricted at the election of management for potential insurance claims 52,600,000   52,600,000   35,800,000  
Underwriting expenses 1,700,000 1,800,000 4,700,000 (400,000)    
Casualty insurance premiums 10,900,000 7,900,000 20,900,000 16,700,000    
Premium revenues and expenses 17,700,000 13,200,000 34,100,000 26,900,000    
Stop-loss program, maximum amount of claim   50,000        
Stop-loss medical expenses 2,500,000 3,600,000 $ 5,300,000 6,900,000    
Cumulative inflation rate before a country is considered highly inflationary     100.00%      
Foreign currency losses $ 100,000 $ 2,400,000 $ 300,000 $ 3,300,000    
International Locations | Geographic Concentration Risk | Operating Revenue            
Summary Of Significant Accounting Policies [Line Items]            
Concentration percentage 7.40% 5.90% 7.50% 7.50%    
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Number of geographical areas operating | geographical_area     1      
Argentina            
Summary Of Significant Accounting Policies [Line Items]            
Cash $ 16,300,000   $ 16,300,000      
South America | International Locations | Geographic Concentration Risk | Operating Revenue | International Solutions            
Summary Of Significant Accounting Policies [Line Items]            
Concentration percentage 86.30% 75.80% 88.40% 76.60%    
Acquisition of Drilling Technologies Companies            
Summary Of Significant Accounting Policies [Line Items]            
Restricted cash and cash equivalents $ 600,000   $ 600,000   $ 1,100,000