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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2019
Summary Of Significant Accounting Policies [Line Items]        
Foreign currency losses $ 8,200 $ 4,000 $ 7,100  
Restricted cash and cash equivalents 35,000 41,800    
Restricted cash and cash equivalents from initial capitalization of captive insurance company 2,000 2,000    
Additional cash and cash equivalents restricted at the election of management for potential insurance claims 30,000 28,500    
Reserves for excess and obsolete inventory 11,500 9,900    
Capitalized interest 0 400 300  
Contract drilling services $ 2,785,557 $ 2,474,458 1,792,476  
Cumulative inflation rate before a country is considered highly inflationary 100.00%      
Operating Revenues | Geographic Concentration Risk | International Locations        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage 7.60% 9.60%    
Segment Revenue | International Land | Geographic Concentration Risk | International Locations | South America        
Summary Of Significant Accounting Policies [Line Items]        
Concentration percentage 91.60% 96.00%    
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life of finite-lived intangible assets used for amortization 5 years      
Lease term 3 years      
Deductible per occurrence $ 1,000      
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life of finite-lived intangible assets used for amortization 20 years      
Lease term 10 years      
Deductible per occurrence $ 5,000      
Reimbursements Received for Out-of-Pocket Expenses        
Summary Of Significant Accounting Policies [Line Items]        
Contract drilling services 322,800 $ 274,700 179,900  
Contract Drilling - Early Termination        
Summary Of Significant Accounting Policies [Line Items]        
Contract drilling services 11,300 17,100 $ 29,400  
Acquisition of Drilling Technologies Companies        
Summary Of Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents $ 3,000 $ 11,300    
ASU 2016-02 | Subsequent Event | Forecast        
Summary Of Significant Accounting Policies [Line Items]        
Lease assets       $ 100,000
Lease liabilities       $ 100,000