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STOCK-BASED COMPENSATION - Schedule of Compensation Cost for Stock-Based Payment Arrangements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 7,431 | $ 7,945 | $ 15,704 | $ 14,163
Drilling services operating |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 1,532 | 1,282 | 2,917 | 2,522
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 486 | 393 | 912 | 746
Selling, general and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 5,413 | $ 6,270 | $ 11,875 | $ 10,895

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