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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2022 rig | Sep. 30, 2025 USD ($) ft² rig | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) rig
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation |  | $ 574,500 | $ 390,900 | $ 375,700
Abandonments included in depreciation |  | 2,900 | 6,500 | 3,300
Rigs damaged by fire | rig | 1 |  |  |
Gain on involuntary conversion |  | 5,500 |  |
Assets held-for-sale |  | 15,231 | 0 |
Asset impairment charges |  | 194,030 | 0 | 12,097
Property, plant and equipment, net |  | 4,313,074 | 3,016,277 |
Gain on reimbursement of drilling equipment |  | (33,398) | (33,309) | (48,173)
Other loss on sale of assets |  | 1,541 | $ 5,139 | 8,016
North America Solutions |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Asset impairment charges |  | 1,507 |  | 3,948
Drilling services equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Assets held for sale |  | 1,700 |  |
Property, plant, and equipment, salvage value |  | 200 |  |
Disposed sale of assets |  | 0 |  |
Real estate asset held for sale |  | 15,200 |  |
Drilling services equipment | North America Solutions |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Asset impairment charges |  | $ 1,500 |  |
Assets Previously Held For Sale |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant, and equipment, salvage value |  |  |  | 300
Asset impairment charges |  |  |  | 2,700
Property, plant and equipment, net |  |  |  | 3,000
Additional Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant, and equipment, salvage value |  |  |  | 100
Asset impairment charges |  |  |  | 1,300
Property, plant and equipment, net |  |  |  | $ 1,400
International FlexRig |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of rigs, held-for -sale | rig |  |  |  | 4
Property, plant, and equipment, salvage value |  |  |  | $ 700
Property, plant and equipment, net |  |  |  | 8,800
Non-cash impairment charge |  |  |  | $ 8,100
Conventional Drilling Rigs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of rigs, held-for -sale | rig |  |  |  | 4
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Area of real estate property | ft² |  | 371 |  |
Assets held-for-sale |  | $ 12,000 |  |
Number of rigs, held-for -sale | rig |  | 16 |  |
Assets held for sale |  | $ 3,200 |  |

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