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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 15, 2021
USD ($)
Nov. 15, 2021
USD ($)
transaction
Sep. 30, 2021
USD ($)
rig
Mar. 31, 2022
USD ($)
rig
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
rig
Mar. 31, 2020
USD ($)
Sep. 30, 2022
USD ($)
rig
service
Sep. 30, 2021
USD ($)
rig
Sep. 30, 2020
USD ($)
industrial_site
Dec. 31, 2021
USD ($)
Property, Plant and Equipment [Line Items]                      
Net book value     $ 3,127,287         $ 2,960,809 $ 3,127,287    
Tangible asset impairment charges             $ 83,500        
Depreciation               396,000 412,500 $ 474,700  
Abandonments included in depreciation               6,600 2,000 4,000  
Asset impairment charges               4,363 70,850 563,234  
Sale of assets held-for-sale               67,592 6,476    
Gain on reimbursement of drilling equipment               (29,443) (12,322) (26,959)  
Other (gain) loss on sale of assets               (5,432) 11,280 (19,816)  
Assets held-for-sale     71,453         4,333 71,453 0  
Other capital expenditures related to assets held-for-sale               (21,645) 0 $ 0  
Number of industrial sites | industrial_site                   6  
Total consideration                   $ 40,700  
Real estate properties                   13,500  
Gain on sale of investments                   27,200  
Disposal Group, Held-for-sale, Not Discontinued Operations                      
Property, Plant and Equipment [Line Items]                      
Other (gain) loss on sale of assets               (3,100)      
United States                      
Property, Plant and Equipment [Line Items]                      
Net book value     3,042,140         2,872,145 3,042,140    
Domestic And International Conventional, Flex Rig3 And Flex Rig4 Asset Groups                      
Property, Plant and Equipment [Line Items]                      
Net book value               605,800      
Tangible asset impairment charges                   441,400  
Domestic And International Conventional, Flex Rig3 And Flex Rig4 Asset Groups | North America Solutions                      
Property, Plant and Equipment [Line Items]                      
Tangible asset impairment charges                   292,400  
Domestic And International Conventional, Flex Rig3 And Flex Rig4 Asset Groups | International Solutions                      
Property, Plant and Equipment [Line Items]                      
Tangible asset impairment charges                   149,000  
In Process Drilling Equipment                      
Property, Plant and Equipment [Line Items]                      
Net book value                   68,400  
Tangible asset impairment charges             44,900        
In Process Drilling Equipment | North America Solutions                      
Property, Plant and Equipment [Line Items]                      
Tangible asset impairment charges             75,800        
Rotational Inventory                      
Property, Plant and Equipment [Line Items]                      
Net book value                   $ 38,600  
Tangible asset impairment charges             38,600        
Rotational Inventory | International Solutions                      
Property, Plant and Equipment [Line Items]                      
Tangible asset impairment charges             $ 7,700        
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   2,580 77,929    
Asset impairment charges                 56,400    
Sale of assets held-for-sale               $ 6,500 2,600    
FlexRig4 Asset Group                      
Property, Plant and Equipment [Line Items]                      
Net book value     $ 55,600           $ 55,600    
Number of rigs, held-for -sale | rig     8         8 8    
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)      
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 Arab Emirates                      
Property, Plant and Equipment [Line Items]                      
Number of rigs, held-for -sale | rig     2           2    
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 held-for-sale               1,100      
Assets Related To Trucking And Casino Running Services | North America Solutions                      
Property, Plant and Equipment [Line Items]                      
Net book value               23,200      
Asset impairment charges               14,400      
Proceeds from sale of assets   $ 6,000                  
Other (gain) loss on sale of assets $ 3,400                    
Assets held-for-sale               $ 8,800      
Number of services offered | service               2      
Percentage of consolidated revenue               2.80%      
Number of transactions | transaction   2                  
Partial Rig Substructures | North America Solutions                      
Property, Plant and Equipment [Line Items]                      
Net book value               $ 2,000      
Number of rigs, held-for -sale | rig       2              
Property, plant, and equipment, salvage value                     $ 100
Asset impairment charges               $ 1,900      
International FlexRig | International Solutions                      
Property, Plant and Equipment [Line Items]                      
Net book value                     3,400
Number of rigs, held-for -sale | rig       2       2      
Asset impairment charges               $ 2,500      
Proceeds from sale of assets       $ 900              
Assets held-for-sale                     $ 900
Offshore Platform Rig | Offshore Gulf of Mexico                      
Property, Plant and Equipment [Line Items]                      
Net book value     $ 2,800           $ 2,800    
Proceeds from sale of assets                 12,000    
Other (gain) loss on sale of assets                 (9,200)    
Drilling Equipment And Spares                      
Property, Plant and Equipment [Line Items]                      
Other (gain) loss on sale of assets                 $ 31,200