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CONVERTIBLE SENIOR NOTES - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,401	$ 2,362	$ 2,163	$ 2,137	$ 2,107	$ 2,077	$ 2,040	$ 2,008	$ 9,063	$ 8,232	$ 5,129
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense									1,615	1,179
Amortization of debt discount and issuance costs									7,546	7,053
Total interest expense recognized									$ 9,161	$ 8,232

X

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Amount of amortization expense attributable to debt issuance costs.

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