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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) |

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