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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2022 rig | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) rig | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) rig | Sep. 30, 2023 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation |  | $ 102,900,000 | $ 94,600,000 | $ 195,300,000 | $ 189,500,000 |
Abandonments included in depreciation |  | 2,600,000 | 1,000,000 | 3,100,000 | 2,100,000 |
Accelerated depreciation |  | 7,300,000 | 800,000 | 8,200,000 | 1,700,000 |
Rigs damaged by fire | rig | 1 |  |  |  |  |
Abandonment expense |  |  |  |  | 9,200,000 |
Insurance proceeds |  |  |  |  |  | $ 9,200,000
Gain on involuntary conversion |  | 5,500,000 |  |  |  |
Insurance proceeds from involuntary conversion |  | 5,000,000 |  | 4,980,000 | 0 |
Outstanding receivable |  | 500,000 |  | 500,000 |  |
Asset impairment charges |  | 0 | 0 | 0 | 12,097,000 |
Property, plant and equipment, net |  | 2,993,825,000 |  | 2,993,825,000 |  | $ 2,921,695,000
Impairment charge for assets held for sale |  |  |  |  | 1,300,000 |
Gain on reimbursement of drilling equipment |  | $ 7,461,000 | 11,574,000 | $ 14,955,000 | 27,298,000 |
Assets Previously Held For Sale |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  |  | 3,000,000 |  | 3,000,000 |
Property, plant, and equipment, salvage value |  |  | 300,000 |  | 300,000 |
Impairment charge for assets held for sale |  |  |  |  | 2,700,000 |
International FlexRig |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  |  | 8,800,000 |  | 8,800,000 |
Property, plant, and equipment, salvage value |  |  | $ 700,000 |  | 700,000 |
Impairment charge for assets held for sale |  |  |  |  | $ 8,100,000 |
Number of rigs, held-for -sale | rig |  |  | 4 |  | 4 |
Conventional Drilling Rigs |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  | 4 |  | 4 |
Additional Equipment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  |  | $ 1,400,000 |  | $ 1,400,000 |
Property, plant, and equipment, salvage value |  |  | $ 100,000 |  | $ 100,000 |

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