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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) rig site | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) rig | Jun. 29, 2019 USD ($) rig
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value |  | $ 3,646,341 | $ 4,502,084 |  |  |
Tangible asset impairment charges |  | 83,500 |  |  |  |
Asset impairment charges |  | 563,234 | 224,327 | $ 23,128 |  |
Depreciation |  | 474,700 | 556,900 | 578,400 |  |
Abandonments included in depreciation |  | 4,000 | 11,400 | 27,700 |  |
Gain on sale of assets |  | $ 46,775 | 39,691 | 22,660 |  |
Number of industrial sites | site |  | 6 |  |  |  |
Total consideration |  | $ 40,700 |  |  |  |
Real estate properties |  | 13,500 |  |  |  |
Gain on sale of investments |  | 27,200 |  |  |  |
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
FlexRig4 Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value |  |  |  |  |  | $ 235,300
Asset impairment charges |  |  | 224,300 |  |  |
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 |  |  |
Six Conventional Rigs Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value of certain rig components transferred |  |  |  | 8,500 |  |
Impairment charge for assets held for sale |  |  |  | 9,200 |  |
Impairment charge for asset held for use |  |  |  | 1,400 |  |
Six Conventional Rigs Asset Group | International Solutions |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value |  |  |  | 20,800 |  |
Decommissioned Rigs |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Impairment charge for asset held for use |  |  |  | $ 5,700 |  |
Domestic Conventional Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs decommissioned | rig |  | 2 |  |  |  |
Flex Rig3 Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of rigs decommissioned | rig |  | 35 |  |  |  |

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