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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 15, 2021 USD ($) service transaction | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) rig service | Sep. 30, 2020 USD ($) industrial_site | Sep. 30, 2019 USD ($) | Mar. 31, 2021 USD ($) rig | Jun. 30, 2019 USD ($) rig | Jun. 29, 2019 USD ($) rig
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  | $ 3,127,287 | $ 3,646,341 |  |  |  |
Tangible asset impairment charges |  |  |  | 83,500 |  |  |  |
Asset impairment charges |  |  | 70,850 | 563,234 | $ 224,327 |  |  |
Depreciation |  |  | 412,500 | 474,700 | 556,900 |  |  |
Abandonments included in depreciation |  |  | 2,000 | 4,000 | 11,400 |  |  |
Assets held-for-sale |  |  | 71,453 | 0 |  |  |  |
Gain (loss) on sale of assets |  |  | 1,042 | $ 46,775 | 39,691 |  |  |
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] |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | 3,100 |  |  |  |  |
United States |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  | 3,042,140 | 3,562,525 |  |  |  |
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 Flex Rig4 Asset Group |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | $ 107,500 | $ 317,800
Number of drill rigs evaluated for impairment | rig |  |  |  |  |  |  | 20 | 71
International FlexRig4 Asset Group |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  |  |  |  |  | $ 47,800 | $ 55,700
Number of drill rigs evaluated for impairment | rig |  |  |  |  |  |  | 8 | 10
Domestic Non Super Spec Asset Group | North America Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  | 6,500 |  |  |  |  |
Asset impairment charges |  |  | 56,400 |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  |  |  |  | 71 |  |
Assets held-for-sale |  |  |  |  |  | $ 13,500 |  |
FlexRig4 Asset Group |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  | 55,600 |  |  |  |  | $ 235,300
Asset impairment charges |  |  | $ 24,000 |  | 224,300 |  |  |
Number of rigs, held-for -sale | rig |  |  | 8 |  |  |  |  |
Assets held-for-sale |  |  | $ 29,000 |  |  |  |  |
Proceeds from sale of assets |  |  | $ 86,500 |  |  |  |  |
Period for delivery and commissioning of rigs sold |  |  | 12 months |  |  |  |  |
FlexRig4 Asset Group | United Arab Emirates |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  | 2 |  |  |  |  |
FlexRig4 Asset Group | United States |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of rigs, held-for -sale | rig |  |  | 6 |  |  |  |  |
FlexRig4 Asset Group | North America Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | 216,900 |  |  |
FlexRig4 Asset Group | International Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | $ 7,400 |  |  |
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 |  |  |  |  |
Assets held-for-sale |  |  | $ 8,800 |  |  |  |  |
Number of services offered | service |  |  | 2 |  |  |  |  |
Percentage of consolidated revenue |  |  | 2.80% |  |  |  |  |
Assets Related To Trucking And Casino Running Services | North America Solutions | Subsequent Event |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of assets | $ 5,800 |  |  |  |  |  |  |
Number of services offered | service | 2 |  |  |  |  |  |  |
Percentage of consolidated revenue | 2.80% |  |  |  |  |  |  |
Number of transactions | transaction | 2 |  |  |  |  |  |  |
Offshore Platform Rig | Offshore Gulf of Mexico |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net book value |  |  | $ 2,800 |  |  |  |  |
Proceeds from sale of assets |  |  | 12,000 |  |  |  |  |
Gain (loss) on sale of assets |  |  | 9,200 |  |  |  |  |
Drilling Equipment And Spares |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | (31,200) |  |  |  |  |
Replacement Value Of Damaged Drill Pipe |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | $ 14,400 | $ 27,000 |  |  |  |

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