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PROPERTY, PLANT AND EQUIPMENT - Property and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
PROPERTY, PLANT AND EQUIPMENT
Gross, property, plant and equipment	$ 9,377,034	$ 9,146,247
Accumulated depreciation	(4,490,086)	(4,288,865)
Property, plant and equipment, net	4,886,948	4,857,382
Contract drilling equipment
PROPERTY, PLANT AND EQUIPMENT
Gross, property, plant and equipment	$ 8,636,213	8,442,081
Contract drilling equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	4 years
Contract drilling equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	15 years
Real estate properties
PROPERTY, PLANT AND EQUIPMENT
Gross, property, plant and equipment	$ 69,937	68,888
Real estate properties | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	10 years
Real estate properties | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	45 years
Other,
PROPERTY, PLANT AND EQUIPMENT
Gross, property, plant and equipment	$ 481,053	471,310
Other, | Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	2 years
Other, | Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives	23 years
Construction in progress
PROPERTY, PLANT AND EQUIPMENT
Gross, property, plant and equipment	$ 189,831	$ 163,968

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

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.

+ References

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

+ References

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- Definition

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.

+ References

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