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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 7,477,539 | $ 7,353,541 |
Accumulated depreciation | (4,516,730) | (4,226,254) |
Property, plant and equipment, net | 2,960,809 | 3,127,287 |
Assets held-for-sale | 4,333 | 71,453 | $ 0
Drilling services equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 6,369,888 | 6,229,011 |
Drilling services equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 4 years |  |
Drilling services equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years |  |
Tubulars |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 4 years |  |
Property, plant and equipment, gross | $ 569,496 | 573,900 |
Real estate properties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 45,557 | 43,302 |
Real estate properties | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years |  |
Real estate properties | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 45 years |  |
Other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 422,479 | 459,741 |
Other | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 2 years |  |
Other | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 23 years |  |
Construction in progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 70,119 | $ 47,587 |

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