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PROPERTY, PLANT AND EQUIPMENT - Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Property, Plant and Equipment |  |  |
Depreciation | $ 583,802 | $ 585,543 | $ 598,587
Abandonments | 27,700 | 42,600 | 39,300
Net book value | 4,857,382 | $ 5,001,051 | $ 5,144,733
Rigs components depreciation |  |  |
Property, Plant and Equipment |  |  |
Net book value | 3,700 |  |
Increase in depreciation | 9,700 |  |
Remainder of fiscal year | 900 |  |
2019 | (2,300) |  |
2020 | (2,300) |  |
2021 | (2,200) |  |
2022 | (1,300) |  |
2023 | (400) |  |
Thereafter | $ (1,000) |  |

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- Definition Amount of increase (decrease) in depreciation expense due the change in estimated useful life for property plant and equipment with a finite life expected to be recognized after the sixth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of increase (decrease) in depreciation expense due the change in estimated useful life for property plant and equipment with a finite life expected to be recognized in the remainder of the fiscal year. + References No definition available. + Details
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- Definition Amount of increase (decrease) in depreciation expense due the change in estimated useful life for property plant and equipment with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of increase (decrease) in depreciation expense due the change in estimated useful life for property plant and equipment with a finite life expected expected to be recognized during the second fiscal year following the latest fiscal year. + References No definition available. + Details
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