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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,442,417	$ 7,477,539
Accumulated depreciation	(4,500,358)	(4,516,730)
Property, plant and equipment, net	2,942,059	2,960,809
Assets held-for-sale	1,551	4,333
Drilling services equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,300,279	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	$ 570,833	569,496
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 46,260	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	$ 429,724	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	$ 95,321	$ 70,119

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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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