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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Sep. 30, 2021
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 7,417,779 | $ 7,353,541
Accumulated depreciation | (4,430,672) | (4,226,254)
Property, plant and equipment, net | 2,987,107 | 3,127,287
Assets held-for-sale | 25,604 | 71,453
Drilling services equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 6,327,863 | 6,229,011
Drilling services equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 4 years |
Drilling services equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 15 years |
Tubulars |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 4 years |
Property, plant and equipment, gross | $ 573,514 | 573,900
Real estate properties |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 45,308 | 43,302
Real estate properties | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 10 years |
Real estate properties | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 45 years |
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 416,163 | 459,741
Other | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 2 years |
Other | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated Useful Lives | 23 years |
Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 54,931 | $ 47,587

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