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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2022
rig
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
rig
Sep. 30, 2022
USD ($)
rig
Mar. 31, 2022
rig
Property, Plant and Equipment [Line Items]          
Depreciation   $ 390,900,000 $ 375,700,000 $ 396,000,000.0  
Abandonments included in depreciation   6,500,000 3,300,000 6,600,000  
Accelerated depreciation   12,700,000 2,400,000    
Rigs damaged by fire | rig 1        
Abandonment expense     9,200,000    
Insurance recoveries     9,200,000    
Insurance proceeds from involuntary conversion   5,533,000 9,221,000 0  
Gain on involuntary conversion   5,500,000      
Asset impairment charges   0 12,097,000 4,363,000  
Property, plant and equipment, net   3,016,277,000 2,921,695,000    
Other (gain) loss on sale of assets   5,139,000 8,016,000 (5,432,000)  
Assets held-for-sale   0 645,000    
Other capital expenditures related to assets held-for-sale   0 0 21,645,000  
Gain on reimbursement of drilling equipment   (33,309,000) (48,173,000) (29,443,000)  
United Arab Emirates          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, net   2,419,000 $ 10,373,000    
International FlexRig          
Property, Plant and Equipment [Line Items]          
Number of rigs, held-for -sale | rig     4    
Property, plant and equipment, net     $ 8,800,000    
Property, plant, and equipment, salvage value     700,000    
Non-cash impairment charge     $ 8,100,000    
International FlexRig | International Solutions Segment          
Property, Plant and Equipment [Line Items]          
Asset impairment charges       $ 2,500,000  
Number of rigs, held-for -sale | rig       2 2
Property, plant and equipment, net       $ 3,400,000  
Proceeds from sale of assets       900,000  
Assets held-for-sale       900,000  
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     $ 2,700,000    
Property, plant and equipment, net     3,000,000.0    
Property, plant, and equipment, salvage value     300,000    
Additional Equipment          
Property, Plant and Equipment [Line Items]          
Asset impairment charges     1,300,000    
Property, plant and equipment, net     1,400,000    
Property, plant, and equipment, salvage value     100,000    
Assets Related To Trucking And Casino Running Services | North America Solutions          
Property, Plant and Equipment [Line Items]          
Proceeds from sale of assets       6,000,000.0  
Other (gain) loss on sale of assets       3,400,000  
Earnout proceeds from sale   $ 800,000 $ 1,600,000 1,100,000  
Partial Rig Substructures | North America Solutions          
Property, Plant and Equipment [Line Items]          
Asset impairment charges       $ 1,900,000  
Number of rigs, held-for -sale | rig       2  
Property, plant and equipment, net       $ 2,000,000  
Property, plant, and equipment, salvage value       $ 100,000  
FlexRig4 Asset Group | United Arab Emirates          
Property, Plant and Equipment [Line Items]          
Number of rigs, held-for -sale | rig       8  
Property, plant and equipment, net       $ 55,600,000  
Other (gain) loss on sale of assets       (3,100,000)  
Sale of property, plant and equipment, selling costs       27,800,000  
Other capital expenditures related to assets held-for-sale       $ 21,600,000