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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) rig $ / shares | Sep. 30, 2018 USD ($) rig $ / shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) rig $ / shares | Sep. 30, 2017 USD ($) | Jun. 29, 2019 USD ($) rig
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value |  | $ 4,857,382 | $ 4,502,084 | $ 4,857,382 | $ 5,001,051 |
Asset impairment charge |  |  | 224,327 | 23,128 | 0 |
Asset impairment charge, net of tax | $ 173,200 | $ 17,200 |  |  |  |
Asset impairment charge, net of tax, per diluted share (in dollars per share) | $ / shares | $ 1.58 | $ 0.16 |  |  |  |
Depreciation |  |  | 556,900 | 578,400 | 584,400 |
Abandonments included in depreciation |  |  | 11,400 | 27,700 | 42,600 |
Expected change in depreciation expense in future periods: |  |  |  |  |  |
Gain on sale of assets |  |  | 39,691 | 22,660 | $ 20,627 |
Change in the Estimated Useful Lives of Rig Components |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Increase in depreciation expense |  |  | 4,700 |  |  |
Expected change in depreciation expense in future periods: |  |  |  |  |  |
2020 |  |  | 800 |  |  |
2021 |  |  | 800 |  |  |
2022 |  |  | 600 |  |  |
2023 |  |  | 300 |  |  |
2024 |  |  | 300 |  |  |
Thereafter |  |  | 500 |  |  |
Domestic Flex Rig4 Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of drill rigs evaluated for impairment | rig | 20 |  |  |  |  | 71
Net book value | $ 107,500 |  |  |  |  | $ 317,800
International FlexRig4 Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of drill rigs evaluated for impairment | rig | 8 |  |  |  |  | 10
Net book value | $ 47,800 |  |  |  |  | $ 55,700
FlexRig4 Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value |  |  |  |  |  | $ 235,300
Asset impairment charge |  |  | 224,300 |  |  |
Asset impairment charge, net of tax |  |  | $ 195,000 |  |  |
Asset impairment charge, net of tax, per diluted share (in dollars per share) | $ / shares |  |  | $ 1.78 |  |  |
FlexRig4 Asset Group | U.S. Land |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Asset impairment charge |  |  | $ 216,900 |  |  |
Asset impairment charge, net of tax |  |  | $ 188,600 |  |  |
Asset impairment charge, net of tax, per diluted share (in dollars per share) | $ / shares |  |  | $ 1.72 |  |  |
FlexRig4 Asset Group | International Land |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Asset impairment charge |  |  | $ 7,400 |  |  |
Asset impairment charge, net of tax |  |  | $ 6,400 |  |  |
Asset impairment charge, net of tax, per diluted share (in dollars per share) | $ / shares |  |  | $ 0.06 |  |  |
Decommissioned Rigs |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Impairment charge for asset held for use |  |  |  | 5,700 |  |
Impairment charge for asset held for use, net of tax |  |  |  | $ 4,200 |  |
Impairment charge for asset held for use, net of tax, per diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.04 |  |
Six Conventional Rigs Asset Group |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value of certain rig components transferred |  | $ 8,500 |  | $ 8,500 |  |
Impairment charge for assets held for sale |  |  |  | 9,200 |  |
Impairment charge for assets held for sale, net of tax |  |  |  | $ 7,000 |  |
Impairment charge for assets held for sale, net of tax, per diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.06 |  |
Impairment charge for asset held for use |  |  |  | $ 1,400 |  |
Impairment charge for asset held for use, net of tax |  |  |  | $ 1,000 |  |
Impairment charge for asset held for use, net of tax, per diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |
Six Conventional Rigs Asset Group | International Land |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net book value |  | $ 20,800 |  | $ 20,800 |  |
Number of rigs to be transferred | rig |  | 6 |  | 6 |  |

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