PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,578,912	$ 7,840,405
Accumulated depreciation	(5,265,838)	(4,824,128)
Property, plant and equipment, net	4,313,074	3,016,277
Assets held-for-sale	15,231	0
Drilling services equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,168,906	6,671,975
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	$ 597,933	552,773
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,223	48,617
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	$ 620,908	460,857
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	$ 182,942	$ 106,183

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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