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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,670,267	$ 7,548,697
Accumulated depreciation	(4,699,896)	(4,627,002)
Property, plant and equipment, net	2,970,371	2,921,695
Assets held-for-sale	0	645
Drilling services equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,463,137	6,396,612
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	$ 583,989	564,032
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 48,033	47,313
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	$ 450,114	443,366
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	$ 124,994	$ 97,374

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- Definition

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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