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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Sep. 30, 2022
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 7,492,361 | $ 7,477,539
Accumulated depreciation | (4,561,060) | (4,516,730)
Property, plant and equipment, net | 2,931,301 | 2,960,809
Assets held-for-sale | 1,349 | 4,333
Drilling services equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 6,338,257 | 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 | $ 571,945 | 569,496
Real estate properties |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 46,293 | 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 | $ 436,243 | 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 | $ 99,623 | $ 70,119

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