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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) rig | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) rig | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Depreciation expense | $ 102,700 |  |  | $ 108,400 | $ 312,400 | $ 366,800 |  |
Abandonments included in depreciation | 1,300 |  |  | 900 | 1,700 | 2,600 |  |
Asset impairment charge | 2,130 |  |  | 0 | 56,414 | 563,234 |  |
Sale of assets held-for-sale | 3,400 |  |  |  | 3,428 |  |  |
Property, plant and equipment, net | 3,281,082 |  |  |  | 3,281,082 |  | $ 3,646,341 |
Tangible asset impairment charges |  |  |  |  |  | 83,500 |  |
(Gain) loss on sale of assets | 3,434 |  |  | 4,201 | (2,745) | 18,790 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
(Gain) loss on sale of assets | $ 1,400 |  |  |  |  |  |  |
Offshore Gulf of Mexico |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  | $ 2,800 |  |  |  |  |
(Gain) loss on sale of assets |  |  |  |  | $ 9,200 |  |  |
Total consideration |  |  | $ 12,000 |  |  |  |  |
Domestic Non Super Spec Asset Group | North America Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of rigs, held-for -sale | rig | 71 |  |  |  | 71 |  |  |
Asset additions |  |  |  |  | $ 13,516 |  |  |
Asset impairment charge |  |  |  |  | $ 56,400 |  |  |
Domestic Asset Group | North America Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Asset impairment charge | $ 2,100 |  |  |  |  |  |  |
Domestic and International Conventional, FlexRig3, and FlexRig4 Asset Groups |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |  |  | $ 605,800
Tangible asset impairment charges |  |  |  | 441,400 |  | 441,400 |  |
Domestic and International Conventional, FlexRig3, and FlexRig4 Asset Groups | North America Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Tangible asset impairment charges |  |  |  |  |  | 292,400 |  |
Domestic and International Conventional, FlexRig3, and FlexRig4 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] |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  | 68,400 |  | 68,400 |  |
Tangible asset impairment charges |  |  |  | 44,900 |  | 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] |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  | 38,600 |  | 38,600 |  |
Tangible asset impairment charges |  |  |  | $ 38,600 |  | 38,600 |  |
Rotational Inventory | International Solutions |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Tangible asset impairment charges |  |  |  |  |  | $ 7,700 |  |
Inventory Scrap and Obsolete, Capital Spares |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
(Gain) loss on sale of assets | $ 2,000 |  |  |  |  |  |  |
Excess Drilling Equipment And Spares |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
(Gain) loss on sale of assets |  | $ (23,000) |  |  |  |  |  |

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