REVENUE RECOGNITION - Contract Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 40,207	$ 31,682	$ 41,609	$ 32,132
Contract assets, current	12,180	15,818	16,805	18,355
Contract assets, non-current	1,403	3,620	1,793	5,579
Contract liabilities (deferred revenue), current	25,925	21,231	23,746	17,360
Contract liabilities (deferred revenue), non-current	$ 843	$ 753	$ 1,257	$ 957