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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Contract assets    
Contract assets: Trade receivables $ 53,737 $ 77,618
Contract assets: Unbilled revenue 15,910 17,211
Contract liabilities    
Customer deposits 22,374 36,689
Deferred revenue 16,321 18,933
Uncollectible invoices written off $ 10,807 $ 10,220
Percentage of revenue billed from unbilled revenue 79.00%  
Percentage of contract liabilities recognized as revenue 75.00%