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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,615,070	$ 8,486,200
Accumulated depreciation	(4,333,988)	(4,839,859)
Property, plant and equipment, net	3,281,082	3,646,341
Assets held-for-sale	10,088	0
Drilling services equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,456,608	7,313,234
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	$ 602,689	615,281
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 43,358	43,389
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	$ 464,571	464,704
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	$ 47,844	$ 49,592

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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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