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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 |  |

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