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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
USD ($)
greographical_area
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Summary of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 355,010 $ 228,462 $ 347,943 $ 284,355
Restricted cash 39,300 34,100 35,000 $ 41,800
Restricted cash from initial capitalization of captive insurance company 2,000   2,000  
Additional cash restricted at the election of management for potential insurance claims 33,700   30,000  
Restricted cash from other purposes 100      
Underwriting expenses $ 8,500      
Cumulative inflation rate before a country is considered highly inflationary (as a percent) 100.00%      
Aggregate foreign currency gain (loss) $ 1,000 $ (3,900)    
Minimum        
Summary of Significant Accounting Policies [Line Items]        
Rental contract period 1 year      
Insurance coverage deductibles range for claims which occur outside or inside the United States $ 1,000      
Number of geographical areas operating in (more than) | greographical_area 1      
Maximum        
Summary of Significant Accounting Policies [Line Items]        
Rental contract period 15 years      
Insurance coverage deductibles range for claims which occur outside or inside the United States $ 10,000      
Intercompany Eliminations        
Summary of Significant Accounting Policies [Line Items]        
Premium revenues and expenses 7,700      
United States        
Summary of Significant Accounting Policies [Line Items]        
Cash and cash equivalents 315,800      
International Locations        
Summary of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 39,200      
International Locations | Operating Revenue | Geographic Concentration Risk        
Summary of Significant Accounting Policies [Line Items]        
Concentration percentage 7.80% 8.90%    
Argentina        
Summary of Significant Accounting Policies [Line Items]        
Cash $ 30,500      
International Land | South America | International Locations | Segment Operating Revenue | Geographic Concentration Risk        
Summary of Significant Accounting Policies [Line Items]        
Concentration percentage 87.00% 89.10%    
Acquisition of Drilling Technology Companies        
Summary of Significant Accounting Policies [Line Items]        
Restricted cash $ 3,500   $ 3,000