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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands	3 Months Ended				9 Months Ended
	Jun. 30, 2021 USD ($) rig	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) rig	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 102,700			$ 108,400	$ 312,400	$ 366,800
Abandonments included in depreciation	1,300			900	1,700	2,600
Asset impairment charge	2,130			0	56,414	563,234
Sale of assets held-for-sale	3,400				3,428
Property, plant and equipment, net	3,281,082				3,281,082		$ 3,646,341
Tangible asset impairment charges						83,500
(Gain) loss on sale of assets	3,434			4,201	(2,745)	18,790
Disposal Group, Held-for-sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
(Gain) loss on sale of assets	$ 1,400
Offshore Gulf of Mexico
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net			$ 2,800
(Gain) loss on sale of assets					$ 9,200
Total consideration			$ 12,000
Domestic Non Super Spec Asset Group | North America Solutions
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig	71				71
Asset additions					$ 13,516
Asset impairment charge					$ 56,400
Domestic Asset Group | North America Solutions
Property, Plant and Equipment [Line Items]
Asset impairment charge	$ 2,100
Domestic and International Conventional, FlexRig3, and FlexRig4 Asset Groups
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net								$ 605,800
Tangible asset impairment charges				441,400		441,400
Domestic and International Conventional, FlexRig3, and FlexRig4 Asset Groups | North America Solutions
Property, Plant and Equipment [Line Items]
Tangible asset impairment charges						292,400
Domestic and International Conventional, FlexRig3, and FlexRig4 Asset Groups | International Solutions
Property, Plant and Equipment [Line Items]
Tangible asset impairment charges						149,000
In-Process Drilling Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net				68,400		68,400
Tangible asset impairment charges				44,900		44,900
In-Process Drilling Equipment | North America Solutions
Property, Plant and Equipment [Line Items]
Tangible asset impairment charges						75,800
Rotational Inventory
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net				38,600		38,600
Tangible asset impairment charges				$ 38,600		38,600
Rotational Inventory | International Solutions
Property, Plant and Equipment [Line Items]
Tangible asset impairment charges						$ 7,700
Inventory Scrap and Obsolete, Capital Spares
Property, Plant and Equipment [Line Items]
(Gain) loss on sale of assets	$ 2,000
Excess Drilling Equipment And Spares
Property, Plant and Equipment [Line Items]
(Gain) loss on sale of assets		$ (23,000)

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