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PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,548,697	$ 7,477,539
Accumulated depreciation	(4,627,002)	(4,516,730)
Property, plant and equipment, net	2,921,695	2,960,809
Assets held-for-sale	645	4,333	$ 71,453
Drilling services equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,396,612	6,369,888
Drilling services equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	4 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	$ 564,032	569,496
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 47,313	45,557
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	$ 443,366	422,479
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	$ 97,374	$ 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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