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DEBT - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,398	$ 2,263
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	293	293
Amortization of debt discount and issuance costs	2,105	1,970
Total interest expense recognized	$ 2,398	$ 2,263

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