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STOCK-BASED COMPENSATION - Schedule of Compensation Cost for Stock-Based Payment Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 31,594	$ 31,198	$ 32,456
Drilling services operating
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6,555	5,904	5,919
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,816	2,033	1,905
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	22,497	23,261	24,632
Restructuring charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 726	$ 0	$ 0

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- Definition

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

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