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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,525,422 $ 7,840,405
Accumulated depreciation (5,117,266) (4,824,128)
Property, plant and equipment, net 4,408,156 3,016,277
Assets held-for-sale 14,238 0
Drilling services equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,095,850 6,671,975
Drilling services equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 2 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 $ 605,423 552,773
Real estate properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,223 48,617
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 $ 612,104 460,857
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 $ 203,822 $ 106,183