DEBT - Schedule of Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,542	$ 2,398
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	293	293
Amortization of debt discount and issuance costs	2,249	2,105
Total interest expense recognized	$ 2,542	$ 2,398