REVENUE RECOGNITION - Contract Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 52,061	$ 32,132	$ 47,869	$ 35,922
Contract assets, current	15,140	18,355	9,609	7,037
Contract assets, non-current	2,692	5,579	6,839	4,218
Contract liabilities (deferred revenue), current	25,728	17,360	23,779	21,350
Contract liabilities (deferred revenue), non-current	$ 1,020	$ 957	$ 1,211	$ 1,775