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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 7,442,417 | $ 7,477,539
Accumulated depreciation | (4,500,358) | (4,516,730)
Property, plant and equipment, net | 2,942,059 | 2,960,809
Assets held-for-sale | 1,551 | 4,333
Drilling services equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 6,300,279 | 6,369,888
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 | $ 570,833 | 569,496
Real estate properties |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 46,260 | 45,557
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 | $ 429,724 | 422,479
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 | $ 95,321 | $ 70,119

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