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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

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