REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Contract assets
Trade receivables	$ 88,867	$ 22,838
Unbilled revenue	17,474	6,194
Contract liabilities
Customer deposits	39,222	0
Deferred revenue	$ 29,420	$ 26,614
Percentage of revenue billed from unbilled revenue	84.00%
Percentage of contract liabilities recognized as revenue	81.00%