SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Accrued Liabilities and Other Liabilities [Abstract]
Accrued compensation	$ 11,099	$ 12,966
Non-income taxes	4,474	4,596
Accrued interest	3,887	2,975
Other	5,141	5,239
Agreement in Principle	6,501	0
Accrued expenses and other current liabilities	$ 31,102	$ 25,776