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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) rig | Jun. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation expense | $ 108,400 | $ 141,900 |  | $ 366,800 | $ 423,700 |
Abandonments included in depreciation | 900 | 1,400 |  | 2,600 | 6,800 |
Gain on sale of assets | 4,201 | $ 9,960 |  | 18,790 | $ 27,050 |
Property, plant and equipment, net | 3,754,206 |  |  | 3,754,206 |  | $ 4,502,084
Tangible asset impairment charges |  |  |  | 83,500 |  |
Domestic And International Conventional, FlexRig3, And FlexRig4 Asset Groups |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | 605,800 |  |  | 605,800 |  |
Tangible asset impairment charges |  |  |  | 441,400 |  |
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 |  |  |
Rotational Inventory |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | $ 38,600 |  |  | 38,600 |  |
Tangible asset impairment charges |  |  | $ 38,600 |  |  |
Domestic Conventional Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs decommissioned | rig | 2 |  |  |  |  |
FlexRig3 Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs decommissioned | rig | 35 |  |  |  |  |
North America Solutions | Domestic And International Conventional, FlexRig3, And FlexRig4 Asset Groups |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Tangible asset impairment charges |  |  |  | 292,400 |  |
North America Solutions | In-Process Drilling Equipment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Tangible asset impairment charges |  |  |  | 75,800 |  |
International Solutions | Domestic And International Conventional, FlexRig3, And FlexRig4 Asset Groups |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Tangible asset impairment charges |  |  |  | 149,000 |  |
International Solutions | Rotational Inventory |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Tangible asset impairment charges |  |  |  | $ 7,700 |  |

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