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PROPERTY, PLANT AND EQUIPMENT - Impairments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) rig | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) rig | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) rig | Sep. 30, 2018 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | $ 4,583,673 |  | $ 4,583,673 |  |  | $ 4,857,382
Asset impairment charge | 224,327 | $ 0 | 224,327 | $ 0 |  |
Domestic FlexRig4 Asset Group |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | $ 107,500 |  | $ 107,500 |  | $ 317,800 |
Number of drill rigs evaluated for impairment | rig | 20 |  | 20 |  | 71 |
International FlexRig4 Asset Group |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | $ 47,800 |  | $ 47,800 |  | $ 55,700 |
Number of drill rigs evaluated for impairment | rig | 8 |  | 8 |  | 10 |
FlexRig4 Asset Group |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | $ 235,300 |
U.S. Land |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Asset impairment charge | $ 216,900 |  |  |  |  |
International Land |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Asset impairment charge | $ 7,400 |  |  |  |  |

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