LONG-TERM DEBT, NET - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Feb. 18, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 0	$ 26,223
Less current portion of long-term debt	0	(26,223)
Long-term debt, net of current portion	0	0
Line of Credit | Revolving lines of credit to banks under the 2023 Senior Secured Credit Facility
Debt Instrument [Line Items]
Total long-term debt	$ 0	0
Exchangeable Notes | 1.0% Exchangeable Senior Notes due 2025
Debt Instrument [Line Items]
Stated interest rate (percent)	1.00%		1.00%
Total long-term debt	$ 0	$ 26,223