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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Sep. 30, 2025
--- | --- | ---
Property, Plant, and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 9,146,307 | $ 9,578,912
Accumulated depreciation | (5,280,975) | (5,265,838)
Property, plant and equipment, net | 3,865,332 | 4,313,074
Assets held-for-sale | 12,659 | 15,231
Drilling services equipment |  |
Property, Plant, and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 7,728,614 | 8,168,906
Drilling services equipment | Minimum |  |
Property, Plant, and Equipment [Line Items] |  |
Estimated Useful Lives | 2 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 | $ 616,790 | 597,933
Real estate properties |  |
Property, Plant, and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 5,613 | 8,223
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 | $ 634,193 | 620,908
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 | $ 161,097 | $ 182,942

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