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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Revenue from Contract with Customer [Abstract] |  |
Contract assets, net | $ 10,971 | $ 4,563
Change in Contract with Customer, Liability [Roll Forward] |  |
Contract liabilities beginning balance | 29,052 | 28,882
Acquisition of KCA Deutug | 22,982 |
Payment received/accrued and deferred | 104,463 | 61,773
Revenue recognized during the period | (75,284) | (61,603)
Contract liabilities ending balance | $ 81,213 | $ 29,052

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
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