PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended				6 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) rig	Mar. 31, 2022 USD ($) rig	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($) rig transaction	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($) rig service
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 101,100		$ 104,600		$ 199,800	$ 209,700
Abandonments included in depreciation		2,500		500		3,800	400
Asset additions						1,459
Sale of assets held-for-sale						15,539
Property, plant and equipment, net	$ 3,127,287	3,022,335				3,022,335			$ 3,127,287
Assets held-for-sale	$ 71,453	57,373				57,373			71,453
Asset impairment charge		$ 0		54,284		4,363	54,284
Payments to acquire property, plant and equipment held-for-sale						10,550	0
International Solutions
Property, Plant and Equipment [Line Items]
Asset impairment charge						$ 2,500
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						$ 13,500
Sale of assets held-for-sale						1,600			$ 6,500
FlexRig4 Asset Group
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig	8								8
Property, plant and equipment, net	$ 55,600								$ 55,600
Total consideration	$ 86,500					$ 78,800
Period for delivery and commissioning of rigs sold						12 months
FlexRig4 Asset Group | United Arab Emirates
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig	2	2				2			2
Property, plant and equipment, net		$ 4,100				$ 4,100
Gain (loss) on sale of assets						$ 1,200
Selling costs		$ 2,400
FlexRig4 Asset Group | United States
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig	6	6				6			6
Assets held-for-sale		$ 26,600				$ 26,600
Asset impairment charge						11,200
Payments to acquire property, plant and equipment held-for-sale		10,600
FlexRig4 Asset Group | United States | Forecast
Property, Plant and Equipment [Line Items]
Asset impairment charge								$ 15,400
Assets Related To Trucking Services and Casino Running Services
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets		$ 700				$ (300)
Assets Related To Trucking Services and Casino Running Services | North America Solutions
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig		2				2
Property, plant and equipment, net	$ 23,200								$ 23,200
Gain (loss) on sale of assets		$ 1,200	$ (3,400)
Assets held-for-sale	$ 8,800	$ 6,000				$ 6,000			$ 8,800
Number of services offered | service									2
Percentage of consolidated revenue	2.80%								2.80%
Number of transactions | transaction						2
Partial Rig Substructures | North America Solutions
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig		2				2
Property, plant and equipment, net		$ 2,000				$ 2,000
Asset impairment charge						1,900
Scrap value		$ 100				$ 100
International FlexRig | International Solutions
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig		2				2
Property, plant and equipment, net		$ 3,400				$ 3,400
Total consideration		900
Assets held-for-sale		900				900
Replacement Value of Damaged Drill Pipe
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets		$ 6,400			$ 3,800	$ 11,700	5,900
Excess Drilling Equipment and Spares
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets				(23,000)
Offshore Platform Rig
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets				$ (22,300)			$ (12,100)
Offshore Platform Rig | Offshore Gulf of Mexico
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets					$ 9,200