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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2022 rig | Mar. 31, 2023 USD ($) rig | Mar. 31, 2022 USD ($) rig | Mar. 31, 2023 USD ($) rig | Mar. 31, 2022 USD ($) rig | Sep. 30, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation |  | $ 94,600 | $ 101,100 | $ 189,500 | $ 199,800 |
Abandonments included in depreciation |  | 1,000 | 2,500 | 2,100 | 3,800 |
Rigs damaged by fire | rig | 1 |  |  |  |  |
Abandonment expense |  |  |  | 9,200 |  |
Property, plant and equipment, net |  | 2,931,301 |  | 2,931,301 |  | $ 2,960,809
Asset impairment charges |  | 0 | 0 | 12,097 | 4,363 |
Assets held-for-sale |  | 1,349 |  | 1,349 |  | $ 4,333
Other (gain) loss on sale of assets |  | 2,519 | 716 | 4,898 | (313) |
Gain on reimbursement of drilling equipment |  | $ (11,574) | $ (6,448) | $ (27,298) | $ (11,702) |
International FlexRig |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  | 4 |  | 4 |  |
Property, plant and equipment, net |  | $ 8,800 |  | $ 8,800 |  |
Property, plant, and equipment, salvage value |  | $ 700 |  | 700 |  |
Asset impairment charges |  |  |  | $ 8,100 |  |
International FlexRig | International Solutions |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  | 2 |  | 2 |
Property, plant and equipment, net |  |  | $ 3,400 |  | $ 3,400 |
Asset impairment charges |  |  |  |  | 2,500 |
Assets held-for-sale |  |  | $ 900 |  | 900 |
Proceeds from sale of assets |  |  |  |  | 900 |
Conventional Drilling Rigs |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  | 4 |  | 4 |  |
Assets Previously Held For Sale |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  | $ 3,000 |  | $ 3,000 |  |
Property, plant, and equipment, salvage value |  | 300 |  | 300 |  |
Asset impairment charges |  |  |  | 2,700 |  |
Additional Equipment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  | 1,400 |  | 1,400 |  |
Property, plant, and equipment, salvage value |  | $ 100 |  | 100 |  |
Asset impairment charges |  |  |  | 1,300 |  |
Assets Related To Trucking And Casino Running Services | North America Solutions |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  | 6,000 |
Other (gain) loss on sale of assets |  |  |  |  | (3,400) |
Earnout proceeds from sale |  |  |  | $ 1,200 | $ 300 |
Partial Rig Substructures | North America Solutions |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  | 2 |  | 2 |
Property, plant and equipment, net |  |  | $ 2,000 |  | $ 2,000 |
Property, plant, and equipment, salvage value |  |  | $ 100 |  | 100 |
Asset impairment charges |  |  |  |  | $ 1,900 |
FlexRig4 Asset Group | United Arab Emirates |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  | 2 |  | 2 |
Property, plant and equipment, net |  |  | $ 4,100 |  | $ 4,100 |
Other (gain) loss on sale of assets |  |  | $ 1,200 |  | 1,200 |
Sale of property, plant and equipment, selling costs |  |  |  |  | $ 2,400 |

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