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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation expense | $ 130,200 | $ 141,700 | $ 258,500 | $ 281,700 |
Abandonments included in depreciation | 900 | 4,400 | 1,700 | 5,400 |
Gain on sale of assets | 10,310 | $ 11,546 | 14,589 | $ 17,090 |
Property, plant and equipment, net | 3,840,213 |  | 3,840,213 |  | $ 4,502,084
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 |  | 441,400 |  |
In-Process Drilling Equipment And Rotational Inventory |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tangible asset impairment charges |  |  | 83,500 |  |
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 |  |
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 |  |
U.S. Land | Domestic And International Conventional, FlexRig3, And FlexRig4 Asset Groups |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tangible asset impairment charges |  |  | 292,400 |  |
U.S. Land | In-Process Drilling Equipment And Rotational Inventory |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tangible asset impairment charges |  |  | 75,800 |  |
International Land | Domestic And International Conventional, FlexRig3, And FlexRig4 Asset Groups |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tangible asset impairment charges |  |  | 149,000 |  |
International Land | In-Process Drilling Equipment And Rotational Inventory |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tangible asset impairment charges |  |  | $ 7,700 |  |

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