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STOCK-BASED COMPENSATION - Schedule of Compensation Cost for Stock-Based Payment Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8,180	$ 7,051	$ 23,884	$ 21,214
Drilling services operating
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,540	1,340	4,457	3,862
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	500	400	1,411	1,146
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6,140	$ 5,311	$ 18,016	$ 16,206

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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