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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2022 rig	Mar. 31, 2023 USD ($) rig	Mar. 31, 2022 USD ($) rig	Mar. 31, 2023 USD ($) rig	Mar. 31, 2022 USD ($) rig	Sep. 30, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation		$ 94,600	$ 101,100	$ 189,500	$ 199,800
Abandonments included in depreciation		1,000	2,500	2,100	3,800
Rigs damaged by fire | rig	1
Abandonment expense				9,200
Property, plant and equipment, net		2,931,301		2,931,301		$ 2,960,809
Asset impairment charges		0	0	12,097	4,363
Assets held-for-sale		1,349		1,349		$ 4,333
Other (gain) loss on sale of assets		2,519	716	4,898	(313)
Gain on reimbursement of drilling equipment		$ (11,574)	$ (6,448)	$ (27,298)	$ (11,702)
International FlexRig
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig		4		4
Property, plant and equipment, net		$ 8,800		$ 8,800
Property, plant, and equipment, salvage value		$ 700		700
Asset impairment charges				$ 8,100
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
Asset impairment charges					2,500
Assets held-for-sale			$ 900		900
Proceeds from sale of assets					900
Conventional Drilling Rigs
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig		4		4
Assets Previously Held For Sale
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		$ 3,000		$ 3,000
Property, plant, and equipment, salvage value		300		300
Asset impairment charges				2,700
Additional Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		1,400		1,400
Property, plant, and equipment, salvage value		$ 100		100
Asset impairment charges				1,300
Assets Related To Trucking And Casino Running Services | North America Solutions
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets					6,000
Other (gain) loss on sale of assets					(3,400)
Earnout proceeds from sale				$ 1,200	$ 300
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
Property, plant, and equipment, salvage value			$ 100		100
Asset impairment charges					$ 1,900
FlexRig4 Asset Group | United Arab Emirates
Property, Plant and Equipment [Line Items]
Number of rigs, held-for -sale | rig			2		2
Property, plant and equipment, net			$ 4,100		$ 4,100
Other (gain) loss on sale of assets			$ 1,200		1,200
Sale of property, plant and equipment, selling costs					$ 2,400

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