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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,563,944	$ 9,161,704
Accumulated depreciation	(4,723,731)	(4,659,620)
Property, plant and equipment, net	3,840,213	4,502,084
Contract drilling services equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,330,789	7,881,323
Contract drilling services equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Contract 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	$ 615,238	618,310
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 72,517	72,507
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	$ 474,148	471,803
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	$ 71,252	$ 117,761

X

- 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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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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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