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CONVERTIBLE SENIOR NOTES - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,362	$ 2,077	$ 6,662	$ 6,125
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	453	290	1,054	886
Amortization of debt discount and issuance costs	1,908	1,787	5,609	5,239
Total interest expense recognized	$ 2,361	$ 2,077	$ 6,663	$ 6,125

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