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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,840,405 $ 7,548,697
Accumulated depreciation (4,824,128) (4,627,002)
Property, plant and equipment, net 3,016,277 2,921,695
Assets held-for-sale 0 645
Drilling services equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 6,671,975 6,396,612
Drilling services equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 4 years  
Drilling services equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 15 years  
Tubulars    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 4 years  
Property, plant and equipment, gross $ 552,773 564,032
Real estate properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 48,617 47,313
Real estate properties | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 10 years  
Real estate properties | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 45 years  
Other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 460,857 443,366
Other | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 2 years  
Other | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 23 years  
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 106,183 $ 97,374