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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2022
rig
Sep. 30, 2021
USD ($)
rig
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
rig
Sep. 30, 2023
USD ($)
rig
Sep. 30, 2022
USD ($)
rig
Sep. 30, 2021
USD ($)
service
rig
Mar. 31, 2022
rig
Property, Plant and Equipment [Line Items]                
Depreciation         $ 375,700 $ 396,000 $ 412,500  
Abandonments included in depreciation         3,300 6,600 2,000  
Rigs damaged by fire | rig 1              
Abandonment expense         9,200      
Insurance recoveries         9,200      
Asset additions         1,177 2,580    
Asset impairment charges         12,097 4,363 70,850  
Property, plant and equipment, net         2,921,695 2,960,809    
Assets held-for-sale   $ 71,453     645 4,333 71,453  
Other (gain) loss on sale of assets         8,016 (5,432) 11,280  
Other capital expenditures related to assets held-for-sale         0 21,645 0  
Gain on reimbursement of drilling equipment         48,173 29,443 12,322  
Disposal Group, Held-for-sale, Not Discontinued Operations                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets             (3,100)  
United Arab Emirates                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, net         10,373 3,024    
United States                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, net         2,813,707 $ 2,872,145    
Domestic Non Super Spec Asset Group | North America Solutions                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig       71        
Asset additions     $ 13,500 $ 13,500        
Asset impairment charges             $ 56,400  
FlexRig4 Asset Group                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig   8       8 8  
Property, plant and equipment, net   $ 55,600         $ 55,600  
Proceeds from sale of assets   $ 86,500            
Period for delivery and commissioning of rigs sold           12 months    
Other (gain) loss on sale of assets           $ (3,100)    
FlexRig4 Asset Group | United Arab Emirates                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig   2       8 2  
Property, plant and equipment, net           $ 55,600    
Other (gain) loss on sale of assets           (3,100)    
Sale of property, plant and equipment, selling costs           27,800    
Other capital expenditures related to assets held-for-sale           21,600    
FlexRig4 Asset Group | United States                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig   6         6  
Assets Related To Trucking And Casino Running Services                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets           (4,200)    
Assets Related To Trucking And Casino Running Services | North America Solutions                
Property, Plant and Equipment [Line Items]                
Asset impairment charges             $ 14,400  
Property, plant and equipment, net   $ 23,200         $ 23,200  
Proceeds from sale of assets           6,000    
Number of services offered | service             2  
Percentage of consolidated revenue   2.80%         2.80%  
Assets held-for-sale   $ 8,800         $ 8,800  
Other (gain) loss on sale of assets           3,400    
Earnout proceeds from sale         $ 1,600 $ 1,100    
Partial Rig Substructures | North America Solutions                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig           2    
Asset impairment charges           $ 1,900    
Property, plant and equipment, net           2,000    
Property, plant, and equipment, salvage value           $ 100    
International FlexRig                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig         4      
Asset impairment charges         $ 8,100      
Property, plant and equipment, net         8,800      
Property, plant, and equipment, salvage value         $ 700      
International FlexRig | International Solutions                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig           2   2
Asset impairment charges           $ 2,500    
Property, plant and equipment, net           3,400    
Proceeds from sale of assets           900    
Assets held-for-sale           $ 900    
Conventional Drilling Rigs                
Property, Plant and Equipment [Line Items]                
Number of rigs, held-for -sale | rig         4      
Assets Previously Held For Sale                
Property, Plant and Equipment [Line Items]                
Asset impairment charges         $ 2,700      
Property, plant and equipment, net         3,000      
Property, plant, and equipment, salvage value         300      
Additional Equipment                
Property, Plant and Equipment [Line Items]                
Asset impairment charges         1,300      
Property, plant and equipment, net         1,400      
Property, plant, and equipment, salvage value         100      
Drilling Equipment And Spares                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets             31,200  
Drilling Equipment And Spares | North America Solutions                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets         17,100      
Vehicles | North America Solutions                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets         (2,600)      
Other Drilling Equipment | North America Solutions                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets         (2,400)      
Other Miscellaneous Assets | North America Solutions                
Property, Plant and Equipment [Line Items]                
Other (gain) loss on sale of assets         $ (2,500)      
Offshore Platform Rig | Offshore Gulf of Mexico                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, net   $ 2,800         2,800  
Proceeds from sale of assets             12,000  
Other (gain) loss on sale of assets             $ (9,200)